# Mechanics and thermodynamics of propulsion addison

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"Mechanics and Thermodynamics of Propulsion". Addison-Wesley Publishing Company, Inc., USA. ISBN 0-201-14659-2. Each question carry 10 points each, in total 30 points for the assignment. The dead line to submit the assignment 3 is Monday 11 th May 2009 before 16:00. You can hand in your assignment through email only if it is typed not if hand written or at my office, room number L322 located near HPT Kitchen (first floor), call using phone at the entrance with number 7682 to get in. All the best! Page 15

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ROCKET PROPULSION - HOME ASSIGNMENT 4 (Chapter 14) 1. If the loss in an ion thruster may be written as Page 16
= Determine, a. The efficiency b. The thrust-to-power ratio for the xenon ion thruster operating at I sp values of 1000, 2000, 3000, 4000 and 5000. Compare your results with figure 14.6 and 14.7 (problem 6, page 682) Page 17

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2. A resistojet is to be designed to supply a specific impulse of 310 s and a total thrust of 10 N. It is to be operated with ammonia in a nozzle with an area ratio of 100:1 . The specific-heat ratio during the expansion is 1.3, and the expansion may be assumed (first approximation only) to be adiabatic. Determine the maximum temperature for two cases: a. No dissociation of the NH 3 , b. 50% dissociation of the NH 3, (into N 2 and H 2 ) in the heating chamber, followed by frozen expansion. (Problem 10, page 682) 3. Nitrogen is heated in an arcjet from 300 to 7350 K at 1atm and dissociates almost entirely too atomic nitrogen. One-third of the electrical power supplied is lost to the arc chamber walls. The heated N then expands in nozzle of area ratio A/A * = 100 to vacuum. Assuming frozen flow and negligible effects of Page 18
friction and heat transfer, estimate the specific impulse and the thrust-to- power ratio. Take = 5/3. (Problem 14,page 683) γ INSTRUCTIONS: All the question numbers, figures, page numbers correspond to book Hill, P. and Peterson, R. 1992. "Mechanics and Thermodynamics of Propulsion". Addison-Wesley Publishing Company, Inc., USA. ISBN 0-201-14659-2. Each question carry 10 points each, in total 30 points for the assignment. The dead line to submit the assignment 4 is Wednesday 20 th May 2009 before 16:00. You can hand in your assignment through email only if it is typed not if hand written or at my office, room number L322 located near HPT Kitchen (first floor), call using phone at the entrance with number 7682 to get in. Page 19

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All the best! Page 20
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