Found inside – Page 51Note that specific impulse , velocity change , and 8c must be in the same system ... factors are given in Appendix C. First convert AV to English units : AV ... Found inside – Page 65Sometimes the specific impulse is defined as the amount of time a unit of mass of propellant will last for a unit thrust delivered. Found inside – Page 21For example, a resistojet with a specific impulse of 200 s (~2000 m/s exhaust ... 100% efficient conversion of electrical power to exhaust kinetic energy). Found insideUNITS OF SPECIFIC IMPULSE , THE - , SPACE / AERONAUTICS , 42 : 9 , AUG 64 2720. UNIFIED SCREW THREADS- METRIC ... UNITS OF MEASURE , CONVERSION TABLES . Found inside – Page 146... pc/pe = 20 to 25 the specific impulse is Isp = 0.6 to 0.61 of Isp max, ... New mixing and injecting units are used together with the contoured nozzles. Found inside – Page 20An added benefit of the specific impulse is that regardless of the units of ... Thermal Efficiency The ability of an engine to convert the thermal energy ... Found inside – Page 28The common unit for specific impulse is seconds. ... transfer thermodynamic energy (heat and pressure) to a propellant and convert the energized propellant ... Found inside – Page 85... rockets compare directly with the chemical propulsion systems but offer substantially higher specific impulse ( 2-10x ) . ... The primary benefit of a dynamic power conversion unit is to 238 conserve Pu and to provide a more compact unit . Found inside – Page 22In the English system of units the specific impulse is defined in the same ... the conversion factor between the two definitions of specific impulse is the ... Found inside – Page 278... propellant is measured as a mass then specific impulse has units of velocity. The conversion constant between the two versions of specific impulse is g, ... Found inside – Page 86Effective exhaust velocity would have a value that is expressed in the same units as velocity, Example, if an engine has a specific impulse of 2000 seconds, ... Found inside – Page 99APPENDIX B Conversion of U . S . Customary Units to SI Units U . S . customary unit Conversion factor Physical quantity SI unit Angle degree radian 1 . 745x10 - 2 Area 6 . ... 356 Specific impulse Ibf - sec / lbm N - sec / kg 9 . 807 K = ( °F + 459 ... Found inside... System of Units ( SI units ) are presented in alphabetical order of the physical quantity ( e.g. , density , heat flux , specific impulse ) involved . Found inside – Page 144An added benefit of the specific impulse is that regardless of the units of ... 3.5.3 Thermal Efficiency The ability of an engine to convert the thermal ... Found inside – Page 35Specific impulse is defined as force per unit mass flow rate . From equation ( 98 ) u e ųe ( P. - P2 ) A e I Gle = = + ( 99 ) m In rocket literature ... Found inside – Page 32Impulse , Specific Impulse , Units For the simplified considerations the impulse ... then in effect a conversion to a gravitational system is being made . Found inside – Page 429... 291 final drive ratio specific impulse for, 325 English System of Units ... 23 other units, 7 SI unit conversion factors, 6 units of measurement, ... Found inside – Page 34The specific impulse is the reciprocal of the thrust specific propellant consumption , in units of seconds ; therefore , for low values of specific ... Found inside – Page 1281O.14.1.1 Specific Impulse (Isp) In the International System of Units [SI), the unit of specific impulse (Isp) is newton-seconds per kilogram or Ns/kg. Found inside – Page 233Specific impulse (expressed as total impulse per unit weight of prope 11ant, ... of ordinary gas dynamics to convert this to directed kinetic energy. Found inside – Page 2169... their effective specific impulse would be expected to be lower when operated at ... Energy Conversion Engineering Conference , Orlando , FL , 31 Jul . Found inside – Page 2182 ft / seca ) Universal gravitational constant ( lbe - ft2 / sluga ) Specific impulse ( sec ) Total impulse ( 1bc - sec ) A units - conversion constant ( 778 ft - lbm / Btu ) Ratio of specific heats ( dimensionless ) Length ( in or ft ) Length of a propellant ... Found inside – Page 302... 67 unit conversion factors 19 for various gas-turbine engines 32, ... variation with temperature 292 specific impulse [of rocket engine] 182 ... Found inside – Page 137APPENDIX A Conversion of U.S. Customary Units to SI Units Physical quantity U.S. customary unit SI unit Conversion ... N / m2 6895 Rotational speed rpm rad / sec 0.1047 Specific impulse Ibf - sec / lbm m / sec 9.807 Stress psi ( Ibf / in . ) ... Found inside – Page 109specific impulse The impulse per unit weight of a propellant is termed the ... since jet engines cannot completely convert the energy content of the ... Found inside – Page 45... high specific impulse, and integral direct energy conversion without ... thermal control and radiators are expected to be minimal in the MAGNUS units. Found inside – Page 34All the concepts with their units, excluding those of area and of force, ... whilst a lecturer once quoted a specific impulse for ion thrusters for space ... Found inside – Page 107... the following variables are tabulated : ( a ) Specific impulse , Isp : V ... c is a units conversion factor , Ą , is the nozzle throat area and Pc is ... Found inside – Page xiiiUNITS IN ANY technical work, the selection of units is expected to meet the ... for the parameter “specific impulse”, together with the Centigrade heat unit ... Found inside – Page 13It appears that operation atomic ion thrustors with a programed specific impulse would entail considerble complication in the power conversion , the ... Found inside – Page 13Specific impulse has units of seconds , but is really force per unit weight flow rate , that is , specific impulse is a measure of how effectively propellant is converted into useful thrust . If the thrust and mass flow rate are constant over the thrust ... Found inside – Page 536Example 4.4 Specific Impulse The Space Shuttle used two Thiokol (now ATK) ... Solution Converting TSFC to consistent SI units, we have g 1 kg 111 1 kN 4 N ... Found inside – Page 253A measure of the efficiency of propellant usage is the specific impulse ( ISP ) , which is the thrust provided per unit of propellant flow . Found inside – Page 16... statute miles Jeff effective specific impulse , sec k a units conversion constant ks propellant dependent structural factor M molecular weight m mass ... Found inside – Page 282In English units , specific impulse is in pounds force per pounds mass per second ... and are connected by the conversion factor 32.2 lbm - ft / lbm.secʻ . Found inside – Page 37To make a conversion from consistent to mixed units, it is customary to define specific impulse as l-SPI (in seconds, s) (3.10a) where g is the acceleration ... Found inside – Page 14At an area ratio of 2 , the kinetic loss leq - Ik is 1 impulse unit or less ... important in determining the calculated specific impulse by examining the ... Found inside – Page 98Exhaust velocity ve (in units of m/s) can be broken into two parts: the specific impulse (ISP in seconds) and the conversion unit of the Earth's gravity g0 ... Found inside – Page 31This force unit group is known as the newton ( N ) , so that 1 N ( force unit ) ... propellant weight flow rate specific impulse is given as pounds force of ... Found inside – Page 262the expression of the Equivalent Specific Impulse the term in the square ... is a dimensional unit conversion parameter (secz/ft) - ~ _Ib_ ii _ H, g; ... Found inside – Page 271Technical Papers Prepared for the Third NASA Conference on Radiation Energy Conversion at NASA Ames Research Center, Moffett Field, California, ... Using a variant of this engine , preliminary experiments at PSI indicate specific impulse near 900 sec . ... The exhaust power per unit burnout mass necessary to inject a single - stage vehicle into a geosynchronous transfer ellipse , 2 is shown in Fig . 1 . Found inside – Page 8Further , the arc je : is less dependent than the higher specific impulse ... system of the plasma propulsion unit , gives it a much higher reliability and ... This book, a translation of the French title Technologie des Propergols Solides, offers otherwise unavailable information on the subject of solid propellants and their use in rocket propulsion. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. Found inside – Page 3Specific impulse is the velocity of the ejected particles divided by g ; and ions ... which is generally defined as the powerplant weight per unit thrust . We show that perfect propulsion requires a constant momentum mission, as a consequence of Newton's second law. Found inside – Page 463The specific impulse cannot be arbitrarily chosen if the maximum payload is ... of the vehicle per unit power developed and the efficiency of conversion of ... Found inside – Page 39We see that specific impulse is directly proportional to exhaust velocity . ... defined as the thrust per unit propellant flow rate : lonized Neutralizer propellant o ( 1 ) sp F dm dt g OTT Here , F is thrust , g the acceleration of gravity at the earth's ... 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