Fluidics Thrust Vectoring Using Co-Flow Method
Fluidics Thrust Vectoring Using Co-Flow Method
复制标题
使用协流方法的流体推力矢量
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Abdullah
中科院分区：
文献类型：
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作者：
Ali Abdul Almuhsen Al;A. Abdullah
摘要
目前的工作已经对使用协流方法的推力矢量进行了计算和实验研究。实验研究包括设计和建造具有长宽比（4.4）的矩形管道的钻机，以研究各种几何变量对推力矢量角的影响。在质量流量比 ( ) 范围 0 ≤ ≤ 0.23、间隙高度 h/H= (0.0294、0.0588、0.088 和 0.1176) 和柯恩达表面直径 Φ/H= (1.176、2.353 和 3.529) 上进行的一组实验测试。使用四个称重传感器获得负载测量值。计算研究涉及使用 FLUENT 6.3.26 软件对一些实验案例进行 3D 数值求解。结果表明，二次喷流速率的增加导致射流矢量角增大，可以观察到三个区域，低质量流量比时出现死区，然后是可以实现连续推力矢量控制的控制区，最后是饱和区。柯恩达表面直径决定了死区的长度，用于柯恩达效应的小柯恩达表面导致死区范围延长，并且次级间隙高度相对于初级间隙高度与射流矢量角成反比关系。调查表明，获得的实验和计算结果都遵循相似的趋势线。
Abstract
Computational and experimental investigations of thrust vectoring using co flow method had been carried in the present work. The experimental investigation included design and construction of rig with rectangular duct with aspect ratio (4.4) in order to investigate the effect of various geometric variables on thrust vectoring angle. Set of experiments tests carried out over the mass flow ratio ( ) range 0 ≤ ≤ 0.23, gap height h/H= (0.0294, 0.0588, 0.088 and 0.1176) and coanda surface diameter Φ/H= (1.176, 2.353 and 3.529). Load measurements were obtained using four load cells. The computational investigation involved a 3D numerical solution by FLUENT 6.3.26 Software for some of experimental cases. The results show that the increase in secondary jet blowing rate lead to increase the jet vectoring angle, there are three zone can be observed, dead zone appears at low mass flow ratios, then followed by control region in which continuous thrust vector control can be achieved followed by a saturation region. The coanda surface diameter determines the length of the dead zone, which a small coanda surface used for coanda effect resulted in a prolonged dead zone range and the secondary gap height to the primary gap height had inverse relation with jet vectoring angle. The investigation shows that both the experimental and computational results obtained follow a similar trend line.