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A numerical study has been carried out to investigate the gas flows in a micronozzle using a continuum model under both slip and no‐slip boundary conditions. The governing equations were solved with a finite volume method. The numerical model was validated with available experimental data. Numerical results of exit thrust showed good agreement with experimental data except at very low Reynolds numbers. For parametric studies on the effect of geometric scaling, the nozzle throat diameter was varied from 10 to 0.1 mm, whereas throat Reynolds number was varied from 5 to 2000. A correlation has also been developed to calculate the specific impulse at specified throat diameter and Reynolds number. The effect of different gases on the specific impulse of the nozzle, such as helium, nitrogen, argon and carbon dioxide, was also examined. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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V. I. Zapryagaev N. P. Kiselev 《Journal of Applied Mechanics and Technical Physics》2009,50(3):447-453
The flow structure at the initial section of a supersonic underexpanded jet in the presence of a stationary artificial disturbance
in the form of a single microjet is studied experimentally. The influence of gas-dynamic and geometric parameters of the microjet
on the structure of the main supersonic flow and a significant effect of the microjet on the changes in the Pitot pressure
in the shear layer of the supersonic jets are identified. Interaction between the microjet and the main jet flow generates
disturbances of two types propagating in the main jet flow: a disturbance induced by the wake flow behind the microjet and
a weaker disturbance in the form of a low-intensity shock wave (Mach wave type).
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 50, No. 3, pp. 104–111, May–June, 2009. 相似文献
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