Modeling of Two-Stage Ejector for High-Altitude Testing of Satellite Thrusters

Kumaran, R. Manikanda; Sundararajan, T.; Manohar, D. Raja; Dason, David

doi:10.2514/1.j051589

Cited by 5 publications

(1 citation statement)

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“…The choice of the number of ejectors used depends on the pressure recovery offered by each ejector. For that matter, Kumaran et al [11] described some basis for using multi-stage ejectors for satellite thrusters ground testing.…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental investigation of satellite thruster vacuum performance employing supersonic ejectors

Sultan

Khan

Omer

2018

J Braz. Soc. Mech. Sci. Eng.

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The present study is carried out to investigate the performance of a cold gas thruster operating under the vacuum with a high expansion ratio. A pressure recovery system employing diffuser and multistage ejectors is employed to evacuate a vacuum cell whose pressure is an indicating parameter of an operating altitude (i.e. nozzle exit condition). The cold gas thruster has an expansion area ratio of 60. For ejector design, the parameters like the length to diameter ratio (L/D e) and ejector nozzle stagnation pressure (P tot) seem to have significant importance, and their effects on vacuum cell pressure are studied by using both analytical and experimental techniques. Role of second throat type diffuser in the overall pressure recovery is also investigated. The required exit pressure is achieved by a two-stage ejector system having constant area mixing chambers. The ejectors' stagnation pressures are considered from 12 to 20 bars, while (L/D e) is considered from 4.5 to 15 and 2.5 to 16.5 for Ejector-1 and Ejector-2, respectively. Minimum vacuum cell pressure is achieved with the (L/D e) of 7 and 9 and stagnation pressure (P tot) of 18 and 20 bars for Ejector-1 and Ejector-2, respectively. The thrust coefficient (CF) and the specific impulse (Isp) were found in good agreement with the theoretical results.

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Section: Introductionmentioning

confidence: 99%