Words near specific-intent in the Dictionary. Found inside – Page 271The thrust results are presented in the form of air - specific impulse , defined as Sa ( 1 ) mfuel + Mair IV . ... RJPA is a one - dimensional , integral simulation code that uses convenient control volumes to define each component of the engine . Found inside – Page 59... ( 4 ) The bed voltage can be related to the specific Lopulse ( 1 ) by recognizing that the specific Impulse is ' P'defined us ... prescribed mission has been identified , one can define the atent of the power llaits cited in the preceding paragraphs . The dependence of the weight of a given mass on location is a sufficient reason for the abolition of the ” weight” definition of specific impulse. Because of the geocentric factor of g0 in the equation for specific impulse, many prefer to define the specific impulse of a rocket (in particular) in terms of thrust per unit mass flow of propellant (instead of per unit weight flow). On the web page describing the specific impulse, we introduce the equivalent exit velocity Veq which is defined as Veq = v + (p - p0) * A / mdot If we substitute the value of Veq into the momentum equation we have M du = Veq mdot dt mdot dt is the amount of change of the instantaneous mass of the rocket. specific impulse. Specific-impulse meaning A performance measure for rocket propellants that is equal to units of thrust per unit weight of propellant consumed per unit time. It is a definition engineers use to quantify the effectiveness of propellant use in a propulsion system. It represents the force with respect to the amount of propellant used per unit time. All Free. 2. Trends and optimum conditions of mass fraction, boost-velocity, and motor envelope with variations in motor performance parameters and propellant characteristics for the dual-chamber controllable solid propellant rocket motor concept were ... Specific impulse Isp is a widely used measure of performance for chemical, nuclear, and electric rockets. (rocket engineering) Isp, the specific impulse of a rocket engine Translations ISP - Internet service provider…. EN [ spiˈsifik ˈimpʌls] US [ spɪˈsɪfɪk ˈɪmˌpʌls] More. Specific Impulse . 23 May 2012 | Journal of Spacecraft and Rockets, Vol. It is expressed in seconds and represents the time during which 1 kg of propellant is capable of producing a force of 9.81 newtons. It is usually given in seconds for both U.S. For a rocket, the specific impulse defined in this way is simply the 23 May 2012 | Journal of Spacecraft and Rockets, Vol. In physical terms is the amount of impulse the engine produces divided by the weight of the propellant required to create that impulse. Found inside – Page 63If the cathode flow fraction is defined as m . Kc ( 4-3 ) ma and a cathode efficiency is defined as 1 a n = ma mi ( 4-4 ) 1 + K , then the total mass flow rate can be expressed as ... ( 4-6 ) me ma The total specific impulse is defined as the thrust per 63. Because of the geocentric factor of g0 in the equation for specific impulse, many prefer to define the specific impulse of a rocket (in particular) in terms of thrust per unit mass flow of propellant (instead of per unit weight flow). For a constant Thrust F, the Impulse I provided by a motor or a propellant over a specific Period t is defined as; I = F.t . Houston, Texas-based AdAstraRocket's ISS Variable Specific Impulse Magnetoplasma Rocket (Vasimir) test article will be a scale-model engine similar to the VX-200 prototype being operated in … The specific impulse represents the time a particular engine can operate when its thrust equals the initial weight of the propellant used by it. need to provide a thrust to weight ratio of one or more, then I This study has two declared aims: it presents the theoretical basis for a provably ideal comparative process for relaxing flows (ICP) and jus tifies its application to jet and, in particular, rocket engines. Specific impulse describes the efficiency of rocket engines by telling you how much thrust (force) you are going to obtain by burning particular type of fuel at a particular rate: \begin{equation} F_{thrust} = I_{sp} g \frac{dm}{dt} \end{equation} Δv on the other hand describes the required change in velocity for orbital transfer to occur. Question: Define Specific Impulse, Isp. Found inside – Page 4P A 18 It is defined as where P. is chamber presW characteristic velocity with changing y points out that the characteristic velocity is a stronger funcT tion of than of M Y. 6-4 . Specific impulse . Specific impulse , Isp , is defined as the impulse ... Ví dụ về cách dùng “specific impulse” trong một câu từ Cambridge Dictionary Labs Examples of how to use “specific impulse” in a sentence from the Cambridge Dictionary Labs Specific impulse is the ratio of the thrust delivered by a rocket engine, expressed in newtons, to the flow rate multiplied by the weight of ejected propellant.. It is the total impulse that is produced by a unit of propellant as it is consumed. Specific impulse is a measure of the efficiency of rockets and jet engines. Specific Impulse is a Clarion Book of the Year Award Finalist. This definition has been adopted because the second is a universal unit of measure. 12, No. For a constant force, . Default dictionary: Theme. Found inside – Page 18where Isp,g is gross specific impulse given by the definition of propellants. The net specific impulse of DSFR, Isp,n, is defined by rocket 159,11 = Fn/iga (20) Eq. (20) is appeared to be equivalent to Eq.(lO). Thus, Eqs. (22), (23), and (20) and ... This specific impulse is a criterion of the size of engine required for producing a given total thrust. It can be defined as impulse per mass (or thrust per mass flow rate), and it is equal to exhaust velocity and has the SI unit of meter per second. The specific impulse Isp is given by: Isp = Veq / g0 . Found inside – Page 150Defining an effective exhaust velocity c as the thrust divided by the mass flow rate and using the thrust equation of Eq . ( 6 - 2 - 9 ) ... The specific impulse ( or the effective exhaust velocity ) is a measure of the efficiency of the propellant - nozzle ... compressor, combustor, turbine) for an engine for a given mission. Impulse is a term that quantifies the overall effect of a force acting over time. By definition, it is the impulse delivered per unit of propellant consumed, and is dimensionally equivalent to the thrust generated per unit propellant flow rate. However, this value is particularly relevant for launchers. specific impulse - WordReference English dictionary, questions, discussion and forums. If it is given in terms of weight, then specific impulse has units of time. specific impulse n the ratio of the thrust produced by a rocket engine to the rate of fuel consumption: it has units of time and is the length of time that unit weight of propellant would last if used to produce one unit of thrust continuously n the ratio of the thrust produced by … thrust) times time. All Free. Specific impulse is a way to describe the efficiency of rocket and jet engines. The specific impulse can be written in terms of fuel properties and flight and vehicle characteristics as We wish to explore the parameter dependency of the above expression, which is a complicated formula. In a collision, an object experiences a force for a specific amount of time that results in a change in momentum. A study was conducted to compare ballistic performance data obtained during testing at pressure altitudes of approximately 100,000 ft with performance data obtained during actual flights. specific impulse in British English noun the ratio of the thrust produced by a rocket engine to the rate of fuel consumption : it has units of time and is the length of time that unit weight of propellant would last if used to produce one unit of thrust continuously The impulse produced by a rocket is the thrust force F times its duration t in seconds. Found inside – Page 22Test definition, 2. Engine ... N2+2H2 mixture testing The specific impulse as a function of input power is given in Fig. 6. A specific ... The data points in the curve for the specific impulse plot form a well defined band with a width of ± 15 s. noun specific impulse a measure, usually in seconds, of the efficiency with which a rocket engine utilizes its propellants, equal to the number of pounds of thrust produced per pound of propellant burned per second. Specific immunity definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Specific immunity definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Comment on "Definition of Specific Impulse… Thus, it can become chronic and more resistant to eventual treatment. Look it up now! Errata-Ablation of Graphite in High-Speed Air Streams. Found inside – Page 1What is really needed for fast interplanetary travel is both characteristics , namely a high specific impulse ( 3000 sec or greater ) , and an engine thrust - weight ratio that is in the range from 10-2 to 10-1 . The characteristics of a gas - core ... dictionary > specific impulse; specific impulse. What is "specific impulse" in regards to rockets, and how does it relate with thrust? Found inside – Page 4Calculation of SRM performance parameters 4. 1 Total impulse 7 7 is defined as the integration of thrust F over the t,. 7= Fdt (3) 4. 2 Effective impulse 7rf l.i is defined as the integration of thrust F over C<. f 'l+'-Z 7 = Fdt (4) J 4. 3 Specific impulse ... specific impulse n the ratio of the thrust produced by a rocket engine to the rate of fuel consumption: it has units of time and is the length of time that unit weight of propellant would last if used to produce one unit of thrust continuously n the ratio of the thrust produced by … Found inside – Page 540P = stream thrust , defined by Eq . ( 3 ) , lb. ( force ) DEFINITION OF STREAM THRUST Sa air - specific impulse , defined by Eq . ( 11 ) , lb. ( force )sec . per lb. ( mass ) The process to be considered in this section is the fuel - specific impulse ... For example, specific heat of water is defined to be the amount of heat needed to … Define effective speed ratio The ratio of flight speed to jet velocity is known as effective speed ratio. This is likely to become increasingly apparent as rockets penetrate further into interplanetary space. For example, for the pair H 2-0 2 it is equal to between 430 and 480 seconds. Winner of the Luigi Napolitano Award (2006) from the International Academy of Astronautics This book presents the fascinating story of the events that paved the way to space. The specific impulse is given by the equation below. ‘The impulse had a value of 1, and the highest peak in the response is less than 0.25, falling rapidly to tiny values.’ ‘Specific impulse equals thrust multiplied by the time over which the thrust acts.’ ‘The statistically nonzero impulses and the response multipliers are in Table 3.’ On the web page describing the specific impulse, we introduce the equivalent exit velocity Veq which is defined as Veq = v + (p - p0) * A / mdot If we substitute the value of Veq into the momentum equation we have M du = Veq mdot dt mdot dt is the amount of change of the instantaneous mass of the rocket. "Analytical and numerical investigations of the performance of a series of potential dual-mode propulsion systems using ionic liquids are presented. Found inside – Page 464( 15 : 15 ) The specific impulse is defined as the impulse per unit weight of propellant . Thus , in equation form , I I I. ( 15 : 16 ) 8P W Now for steady or stable operation , the thrust generated by the motor is constant ; thus , Fldt F 162 ( 15 : 17 ) W ... It is a definition engineers use to quantify the effectiveness of propellant use in a propulsion system. a measure, usually in seconds, of the efficiency with which a rocket engine utilizes its propellants, equal to the number of pounds of thrust produced per pound of propellant burned per second. The impulse experienced by the object equals the change in momentum of the object. impulse in terms of its value in units of time. Specific impulse definition is - the thrust produced per unit rate of consumption of the propellant that is usually expressed in pounds of thrust per pound of propellant used per second and that is a measure of the efficiency of a rocket engine. Specific impulse and Δv describe different quantities. Impulse is defined as force (i.e. seconds). specific impulse meaning in Estonian » DictZone English-Estonian dictionary. For these reasons it is important to determine not only the performance such as specific impulse (Isp), density specific impulse ( [rho]Isp), and ignition delay of TEA with a given oxidizer, but also the effect a solvent has on the system. These parameters can be altered for a VASIMR as per the mission requirements by altering the amount of power supplied. John A. Segletes. Specific Impulse Specific impulse is a measure of the efficiency of rocket fuels. Rocketrythe specific impulse that a given combination of propellants would produce in an ideal rocket engine providing complete combustion, no friction losses, and no lateral expansion of the exhaust. Specific impulse, abbreviated as [I.sub.sp], is a measure in seconds of propulsion system efficiency in converting fuel energy into momentum. Specific Impulse for an ideal turbojet. Found inside – Page 14To evaluate this influence , a propellant density specific impulse parameter is defined in equation Liquid Hydrocarbon Fuel Performance Hydrocarbon fuels , by definition , are composed of two elemental constituents , carbon ( C ) and ... In rocketry, where the only reaction mass is the propellant, an equivalent way of calculating the specific impulse in seconds is also frequently used. Check 'specific impulse' translations into Czech. By definition, it is the total impulse (or change in momentum) delivered per unit of propellant consumed and is dimensionally equivalent to the generated thrust divided by the propellant mass flow rate or weight flow rate. Define specific thrust and Specific impulse. We can divide this equation by the weight of the propellants to define the specific impulse. ‘The impulse had a value of 1, and the highest peak in the response is less than 0.25, falling rapidly to tiny values.’ ‘Specific impulse equals thrust multiplied by the time over which the thrust acts.’ ‘The statistically nonzero impulses and the response multipliers are in Table 3.’ M-W: specific epithet noun : the Latin or latinized noun or adjective that follows the genus… 5 Replies: specific epithet - [drei Eintäge] Last post 01 Nov 08, 06:27: specific epithet [bot. The Specific Impulse I s is the ratio of the of thrust produced to the weight flow of the propellants (fuel plus oxidiser). Found inside – Page 33On the other hand , if specific impulse is defined as impulse per unit of weight exhausted , then any system of units is suitably converted to yield a ... The result of the force acting for the given amount of time is that the object's mass either speeds up or slows down (or changes direction). the total impulse (or change in momentum) delivered per unit of propellant consumed. The thrust per kg of air flow is known as specific thrust or specific impulse. In this sense, specific impulse is defined as the thrust integrated over time per unit weight-on-Earth of the propellant: 1. Gregory, Don A. Marshall Space Flight Center In a collision, an object experiences a force for a specific amount of time that results in a change in momentum. Found inside – Page 3The range was selected to define the possible operating envelope and allow for a broad comparison of single and two - stage data . ... Anode specific impulse is defined as the specific impulse calculated excluding the cathode flow . Found inside – Page 158The two most commonly used criteria to characterize the energetic performance of an air breathing engine are the specific impulse, Ijp, and the thrust specific fuel consumption, TSFC. The specific impulse is defined as the thrust developed, F, ... Specific impulse (usually abbreviated I) is a measure of the efficiency of rocket and jet engines. adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A Customary and International System (SI) units. _____ This problem has been solved! Found insideThis LAM model is used for the purpose of relating thruster supply pressure to LAM specific impulse . ... 316 990490 - 3 Recommended Normalized Isp 315 Isp , sec 14 313 312 200 260 By definition , specific impulse is thrust divided by mass. Physical definition, the higher the specific impulse... found inside – Page 63If the cathode flow chronic more. 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