用于改善阻力和减少热量的对向射流的攻击角特性

Haonan Xu, Xueying Li, Jing Ren
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摘要

虽然对向射流技术具有实现高效减阻和减热的潜力,但它会受到射流攻角的严重影响。为了分析对向射流的攻角特性以改善阻力和热量的减少,使用验证的数值方法研究了不同射流停滞压力比和攻角下的三维钝模型。结果表明,迎风侧的再附着冲击增强导致压力和温升升高,从而导致阻力和减热效果恶化。在来流攻角的影响下,再循环漩涡转变为纵向漩涡,导致表面压力系数和斯坦顿数呈斜 U 形分布。增大喷流滞压比扩大了再循环漩涡在迎风面和背风面的覆盖范围,从而改善了阻力和热量的减少。由于再循环漩涡的重新附着和入流的压缩,入流攻角与对向射流之间的相互作用导致斯坦顿数出现双峰分布。倾斜的对向射流可以通过沿迎风面扩散再循环漩涡来降低带攻击角的入流的压力系数和斯坦顿数峰值。应该存在一个最佳倾角,既能有效降低来流压缩造成的峰值,又不会因再循环漩涡重新附着而产生过高的峰值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Angle-of-attack characteristics of opposing jet for improving drag and heat reduction
While the opposing jet technique has the potential to achieve efficient drag and heat reduction, it can be severely affected by the incoming angle of attack. To analyze the angle-of-attack characteristics of opposing jet for improving drag and heat reduction, a three-dimensional blunt model was studied under various jet stagnation pressure ratios and angles of attack using the verified numerical method. The results showed that the enhanced reattachment shock on the windward side resulted in a higher pressure and temperature rise, which led to the deterioration of drag and heat reduction. Under the influence of the incoming angle of attack, the recirculation vortex transformed into a longitudinal vortex, resulting in a slanted U-shaped distribution of the surface pressure coefficient and Stanton number. Increasing the jet stagnation pressure ratio widened the coverage of the recirculation vortex on both the windward and leeward sides, which brought an improvement in drag and heat reduction. The interaction between the incoming angle of attack and the opposing jet caused a double-peak distribution of Stanton number due to the recirculation vortex reattachment and the compression of the incoming flow. The inclined opposing jet could reduce the peak values of pressure coefficient and Stanton number when subjected to the incoming flow with an angle of attack by spreading the recirculation vortex along the windward side. There should exist an optimal inclination angle that can effectively reduce the peak caused by the compression of the incoming flow without generating an excessive peak due to the recirculation vortex reattachment.
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