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首页> 外文期刊>Chinese journal of aeronautics >Experimental Investigation of a Fixed-geometry Two-dimensional Mixed-compression Supersonic Inlet with Sweep-forward Highlight and Bleed Slot in an Inverted 'X'-type Layout
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Experimental Investigation of a Fixed-geometry Two-dimensional Mixed-compression Supersonic Inlet with Sweep-forward Highlight and Bleed Slot in an Inverted 'X'-type Layout

机译：固定几何二维混合压缩超音速进气口，前掠高光和排气槽呈倒“ X”型布局

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摘要

A fixed-geometry two-dimensional mixed-compression supersonic inlet with sweep-forward high-light and bleed slot in an inverted "X"-form layout was tested in a wind tunnel. Results indicate: (1) with increases of the free stream Mach number, the total pressure recovery decreases, while the mass flow ratio increases to the maximum at the design point and then decreases; (2) when the angle of attack, α, is less than 6°, the total pressure recovery of both side inlets tends to decrease, but, on the lee side inlet, its values are higher than those on the windward side inlet, and the mass flow ratio on lee side inlet increases first and then falls, while on the windward side it keeps declining slowly with the sum of mass flow on both sides remaining almost constant; (3) with the attack angle, a, rising from 6° to 9°, both total pressure recovery and mass flow ratio on the lee side inlet fall quickly, but on the windward side inlet can be observed decreases in the total pressure recovery and increases in the mass flow ratio; (4) by comparing the velocity and back pressure characterristics of the inlet with a bleed slot to those of the inlet without, it stands to reason that the existence of a bleed slot has not only widened the steady working range of inlet, but also made an enormous improvement in its performance at high Mach numbers. Besides, this paper also presents an example to show how this type of inlet is designed.
机译：在风洞中测试了固定几何形状的二维混合压缩超音速进气口，该进气口具有前向高亮和倒置“ X”形布局中的排气槽。结果表明：（1）随着自由流马赫数的增加，总压力恢复率降低，而质量流量比在设计点达到最大，然后下降； （2）当迎角α小于6°时，两侧进气口的总压力恢复趋于降低，但在背风侧进气口的压力恢复值高于上风侧进气口的压力恢复值；背风侧进气口的质量流量比先增加然后下降，而在迎风侧进气口的质量流量比则保持缓慢下降，而两侧的总风量几乎保持恒定。 （3）在迎角a从6°上升到9°时，风侧入口的总压力恢复率和质量流量比均迅速下降，而迎风侧入口的总压力恢复率则下降，质量流量比增加； （4）通过比较带泄油槽的进气口的速度和背压特性与不带泄油槽的进气口的速度和背压特性，可以认为存在泄油槽不仅扩大了进气口的稳定工作范围，而且在高马赫数下的性能有了巨大的提高。此外，本文还提供了一个示例来说明如何设计这种类型的进样口。

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