Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Investigation effect of the expansion ratio and propellant specifications on performance parameters of a nozzle and validation using experimental test

Document Type : Original Article

Authors
Arezoo Esmaeili 1
adel pourtaghi 2
farhad farhang 3
masoud dehnad 3
1 Iranian space research center, Space thruster research institute , tabriz
2 Iranian space research center, Space thruster research institiute, tabriz
3 Iranian space research center, Space thruster research institute, tabriz
Abstract
In this paper, the effect of variation in the expansion ratio of the convergent-divergent nozzle on the performance parameters such as specific impulse, nozzle output velocity and output temperature is investigated using thermodynamic relations for different propellant. Then, three nozzles with different expansion ratios are manufactured and their thrust force with three different propellants is measured using experimental tests. The results show that with increasing the area expansion ratio, specific impulse, nozzle output velocity, output Mach number and thrust coefficient increase nonlinearly and the nozzle output temperature decreases. In addition, it is observed that with increasing the specific heat ratio of propellants, the output Mach number increases and the thrust coefficient and output temperature decrease. Also, with increasing the specific heat ratio and increasing the specific constant of the gases, the specific impulse and the nozzle output velocity increase. Furthermore, the thrust force increases with increasing nozzle expansion ratio and decreases with increasing propellant heat ratio. Finally, by comparing the thrust force obtained from the thermodynamic relations and their counterpart measured thrust force, the accuracy of the calculations is confirmed.
Keywords
convergent- divergent nozzle
expansion ratio
propulsion specifications
thrust force
experimental test

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Fluid Mechanics & Aerodynamics
Volume 10, Issue 2 - Serial Number 28
بهار و تابستان
February 2022
Pages 185-194

  • Receive Date 10 January 2022
  • Publish Date 20 February 2022