Numerical Investigation of Hypersonic Flat-Plate Boundary Layer Transition Subjected to Bi-Frequency Synthetic Jet
Numerical Investigation of Hypersonic Flat-Plate Boundary Layer Transition Subjected to Bi-Frequency Synthetic Jet
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DOI：
10.3390/aerospace10090766
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发表时间：
2023-08
期刊：
影响因子：
2.6
通讯作者：
Xinyi Liu;Zhen-bing Luo;Qiang Liu;Pan Cheng;Yan Zhou
中科院分区：
文献类型：
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作者：
Xinyi Liu;Zhen-bing Luo;Qiang Liu;Pan Cheng;Yan Zhou
延迟转捩对于高超声速飞行器的减阻减热具有重要意义。在高超声速边界层转捩过程中，第一模态（低频）和第二模态（高频）同时存在。本文提出了一种新的双频合成射流，以抑制低，高频率的干扰在同一时间。采用正交表和方差分析比较了不同位置（USJ或DSJ）、低频（f1）、高频（f2）和振幅（a）的射流控制效果。线性稳定性分析结果表明，在增长率随扰动频率变化的情况下，具有特定频率和幅值的上游合成射流（USJ）可以阻碍第一和第二模态的增长，从而延迟转捩。另一方面，下游合成射流（DSJ），无论其他参数，增加流动不稳定性和加速过渡，与更高的频率和振幅导致更大的增长率为两种模式。低频率对第一模式有显著影响，但对第二模式的影响很弱，而高频率对第一和第二模式都有有利的影响。就增长率随展向波数的变化而言，同一参数在不同展向波数下的控制规律不同，导致控制规律复杂。为了在转捩时获得最佳延迟效果并提高流动的稳定性，双合成射流的参数应选择如下：将其置于上游，f1 = 3.56 kHz，f2 = 89.9 kHz，a = 0.009，使得第一模式的最大增长率与未控制状态相比降低了9.06%，第二模式的最大增长率与未控制状态相比降低了1.28%，其中流场分析揭示了压力脉动的孪晶结构的弱化。
Transition delaying is of great importance for the drag and heat flux reduction of hypersonic flight vehicles. The first mode, with low frequency, and the second mode, with high frequency, exist simultaneously during the transition through the hypersonic boundary layer. This paper proposes a novel bi-frequency synthetic jet to suppress low- and high-frequency disturbances at the same time. Orthogonal table and variance analyses were used to compare the control effects of jets with different positions (USJ or DSJ), low frequencies (f1), high frequencies (f2), and amplitudes (a). Linear stability analysis results show that, in terms of the growth rate varying with the frequency of disturbance, an upstream synthetic jet (USJ) with a specific frequency and amplitude can hinder the growth of both the first and second modes, thereby delaying the transition. On the other hand, a downstream synthetic jet (DSJ), regardless of other parameters, increases flow instability and accelerates the transition, with higher frequencies and amplitudes resulting in greater growth rates for both modes. Low frequencies had a significant effect on the first mode, but a weak effect on the second mode, whereas high frequencies demonstrated a favorable impact on both the first and second modes. In terms of the growth rate varying with the spanwise wave number, the control rule of the same parameter under different spanwise wave numbers was different, resulting in a complex pattern. In order to obtain the optimal delay effect upon transition and improve the stability of the flow, the parameters of the bi-synthetic jet should be selected as follows: position it upstream, with f1 = 3.56 kHz, f2 = 89.9 kHz, a = 0.009, so that the maximum growth rate of the first mode is reduced by 9.06% and that of the second mode is reduced by 1.28% compared with the uncontrolled state, where flow field analysis revealed a weakening of the twin lattice structure of pressure pulsation.