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1 Journal of Theoretical and Applied Mechanics

1 2018

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Study on the effects of preheated wall/plates in microthruster systems

Lekzian E., Parhizkar H., Ebrahimi A.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 3

713--725

In the present paper, eﬀects of pre-heated walls/plates on microthrusters performance are studied using a DSMC/NS solver. Three microthruster conﬁguration types are studied. Type 1 is a cold gas microthrster. Microthruster type 2 has pre-heated walls. Pre-heated plates are inserted inside the chamber of microthruster type 3. It is observed that in microthruster type 2 the ﬂow is accelerated and the speciﬁc impulse is elevated. However, by insertion of the pre-heated plates in microthruster type 3, viscous eﬀects have stronger negative inﬂuence and the thrust is decreased. By implementing temperature gradients on walls in type 2 and on plates in type 3, it is observed that a higher temperature gradient enhances performance parameters of microthruters. Among all types of microthrusters, microthruster type 2 with pre-heated walls has the highest thrust and speciﬁc impulse. Microthruster type 3 with a temperature gradient of 300-500K has the minimum thrust due to a considerable decrease in the mass ﬂow rate.