Thrust Measurement of a Rectangular Hypersonic Nozzle Using an Inclined Baffle Plate
Thrust Measurement of a Rectangular Hypersonic Nozzle Using an Inclined Baffle Plate
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DOI：
10.2514/1.b34546
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发表时间：
2012-11
影响因子：
1.9
通讯作者：
Mikiya Araki;M. Tsukamoto;T. Kojima;H. Taguchi;S. Shiga
中科院分区：
文献类型：
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作者：
Mikiya Araki;M. Tsukamoto;T. Kojima;H. Taguchi;S. Shiga
采用倾斜挡板对日本宇宙航空研究开发机构正在研制的预冷涡轮喷气发动机的矩形高超声速喷管进行了推力测量。制作了缩比为1.0%的喷管模型，并对其总推力进行了研究。高超声速喷管具有可变喉部和外部斜坡，以补偿整个操作过程中喷管压力比的急剧变化。在起飞时，强烈的喷流噪声是由于高速排气喷流，并在本研究中，气动调整片喷流噪声抑制器上的喷管推力矢量的影响进行了研究。由于简单，挡板，它基本上提供了一个轴向力测量，被应用到一个错误的测量的大小和角度的推力矢量，使一个角度的冲击表面相对于射流。结果表明，推力矢量的大小保持不变，无论气动tabmass分数，这意味着可以假设的主射流和气动标签之间的无损混合。研究还表明，由于射流截面的变形，推力角随着气动调整片质量分数的增加而变化。
Thrust measurement of a rectangular hypersonic nozzle employed in the precooled turbojet engine under development in the JapanAerospace Exploration Agency is carried out using an inclined baffle plate. A 1.0%-scaled model of the nozzle was manufactured, and its gross thrust was investigated. The hypersonic nozzle has a variable throat and an external ramp to compensate the drastic change in the nozzle pressure ratio through the operation. At takeoff, an intensive jet noise is expected due to the high-speed exhaust jet, and in the present study, the impact of aerodynamic-tab jet noise suppressors on the thrust vector of the nozzle is investigated. Because of the simplicity, a baffle plate, which basically provides an on-axis forcemeasurement, is applied to a simultaneousmeasurement of the magnitude andangle of the thrust vector by giving anangle to the impact surface relative to the jet. It is shown that the magnitude of the thrust vector is kept constant regardless of the aerodynamic-tabmass fraction, which implies that a lossless mixing between the main jet and aerodynamic tab can be assumed. It is also shown that the thrust angle changes with the increase in the aerodynamic-tab mass fraction because of the deformation of the jet cross section.