Efficiency of aft diffusers in vacuum systems of test benches for high-altitude firing tests of low-thrust liquid rocket engines

Abstract


The article presents the results of calculations and experimental studies of a vacuum system with an aft diffuser for high-altitude firing tests of low-thrust liquid rocket engines. The aim of the study was to determine the geometric dimensions and setting parameters of aft diffusers. The diffusers ensure operation of the vacuum system that implements the regime of unseparated flow of the combustion products in the nozzle of the engine being tested. We carried out the experiments using 50 N liquid rocket engines with the geometric area ratio equal to 50. We investigated the impact of the setting parameters of the aft diffuser relative to the engine’s nozzle exit: the position of the inlet section of the diffuser relative to the nozzle exit varied in the range from -2 to +10 mm in the axial direction. We analyzed the influence of geometrical parameters of aft diffusers that differed in the inner diameter of the channel. The relative channel length was equal to 10. We determined the structural variables of an aft diffuser and its position relative to the engine’s nozzle exit and the pressure ranges after the exit section of the diffuser that ensure the mode of  unseparated flow of the combustion products in the engine nozzle. The efficiency of the vacuum system of the test bench increases as the internal diameter of the aft diffuser approaches the diameter of the nozzle. Other things being equal, the vacuum system provides longer periods of engine tests maintaining the design mode of nozzle operation.


About the authors

R. N. Galperin

Samara National Research University

Author for correspondence.
Email: ke_src@ssau.ru

Russian Federation

Senior Research fellow

Yu. I. Gulyaev

Samara National Research University

Email: ke_src@ssau.ru

Russian Federation

Leading engineer

Yu. S. Ivashin

Samara National Research University

Email: ke_src@ssau.ru

Russian Federation

Candidate of Science (Engineering)
Senior Research fellow

V. E. Nigodjuk

Samara National Research University

Email: ke_src@ssau.ru

Russian Federation

Candidate of Science (Engineering )
Associate Professor 

V. V. Ryzhkov

Samara National Research University

Email: ke_src@ssau.ru

Russian Federation

Candidate of Science (Engineering)
Research Supervisor 

A. V. Sulinov

Samara National Research University

Email: ke_src@ssau.ru

Russian Federation

Candidate of Science (Engineering)
Associate Professor 

References

  1. Galperin R.N., Ivashin Y.S., Nigodjuk V.E., Ryzhkov V.V., Sulinov A.V. Automated thermo vacuum firing test facility for testing and research of workflow in low-thrust rocket engine on hypergolic propellants. Vestnik of the Samara State Aerospace University. 2014. No. 5 (47), part 2. P. 48-58. (In Russ.)
  2. Shishkov A.A., Silin B.M. Vysotnye ispytaniya reaktivnykh dvigateley [High-Altitude testing of jet engines]. Moscow: Mashinostroenie Publ., 1985. 208 p.
  3. Zhukovsky A.E., Kondrusev V.S., Okorochkov V.V. Ispytaniya zhidkostnykh raketnykh dvigateley: ucheb. dlya studentov aviats. spets. vuzov [Tests of liquid rocket engines: textbook for students of aviation specialties]. Moscow: Mashinostroenie Publ., 1992. 352 p.
  4. Galeev A.G. Osnovy ustroystva ispytatel'nykh stendov dlya otrabotki zhidkostnykh raketnykh dvigateley i dvigatel'nykh ustanovok. Rukovodstvo dlya inzhenerov-ispytateley [Basics of design of test benches for testing liquid rocket engines and propulsion systems]. Peresvet: Nauchno-Ispytatel'nyy tsentr Raketno-Kosmicheskoy Promyshlennosti Publ., 2010. 178 p.
  5. Alemasov V.E., Dregalin A.F., Tishin A.P. Teoriya raketnykh dvigateley: uchebnikdlya studentov vtuzov [Theory of rocket engines: textbook for students]. Moscow: Mashinostroenie Publ., 1989. 464 p.
  6. Shustov S.A. Experimental analysis of flow separation in low thrust rocket engine nozzles with a profiled supersonic part of the nozzle. Vestnik of the Samara State Aerospace University. 2009. № 1 (17). P. 90-99. (In Russ.)

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