Performance of Solid Fuel Ramjet with Central Bluff Body for Projectile

doi:10.12382/bgxb.2021.0428

Abstract

Abstract: To develop a high-performance ramjet for projectiles, a scheme of using bluff bodies in the combustion chamber of the solid fuel ramjet is proposed. The turbulent combustion model is established based on equations for Reynolds transition and eddy dissipation, and the internal flow field, combustion efficiency, thrust, specific impulse and total pressure loss of the combustion chamber with or without the bluff body are compared and analyzed by numerical calculation. The findings show that there are two vortices outside the pore behind the central bluff body. The high-speed airflow in the pore and small-scale vortices below has maintained some wake stability, which can ensure the smooth operation of the ramjet. Compared with the reference solid fuel ramjet (without bluff body structure), adding a bluff body in the afterburning chamber can improve the mixing effect and temperature of fuel and air at the downstream of this chamber, which can increase the combustion efficiency. When the intake air mass flow rate was 0.3 kg/s, the ramjet thrust and specific impulse was increased by about 16.21%, and the combustion efficiency improved by about 20.50%, but the enhancement effects would decrease with the increase of air-fuel ratio. Under the same combustion efficiency, adding a bluff body in the combustion chamber can effectively reduce the length of the ramjet and thus leaving installation space for other parts.

Key words: solidfuelramjet, swirlcombustion, bluffbody, thrust, combustionefficiency

CLC Number:

TJ413.⁺4

ZHANG Ning， SHI Jinguang， WANG Zhongyuan， MA Yexuan. Performance of Solid Fuel Ramjet with Central Bluff Body for Projectile[J]. Acta Armamentarii, 2022, 43(7): 1519-1526.

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