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Use of flows with straight sonic line in nozzles with corners

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Abstract

The optimal scheme of a Laval nozzle is discussed. In the case of a profiled nozzle with a corner it is possible to use in the region of mixed flow both flows of general form with curvilinear sonic line as well as the special case when the sonic line is straight. It is shown that the latter alternative is preferable: when the supersonic part of the profile is determined by the “simple wave” method, the velocity at the wall increases monotonically and the flow does not contain shock waves. In contrast, in nozzles with curvilinear sonic line, a section in which the velocity decreases is formed immediately behind the corner, which can lead to boundary layer separation. In addition, for values of the supersonic velocity at the nozzle exit near the velocity of sound it is proved that the characteristics of the simple wave intersect in the flow region.

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Literature cited

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Authors and Affiliations

  1. Moscow

    É. G. Shifrin

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  1. É. G. Shifrin
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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 168–170, January–February, 1981.

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Shifrin, É.G. Use of flows with straight sonic line in nozzles with corners. Fluid Dyn 16, 136–138 (1981). https://doi.org/10.1007/BF01094828

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  • DOI: https://doi.org/10.1007/BF01094828

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