Doranehgard Mohammad Hossein, Gupta Vikrant, Li Larry K B
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, China and Guangdong-Hong-Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications, Southern University of Science and Technology, Shenzhen, China.
Phys Rev E. 2022 Jun;105(6-1):064206. doi: 10.1103/PhysRevE.105.064206.
We numerically explore the quenching and amplification of self-excited thermoacoustic oscillations in two nonidentical Rijke tubes interacting via time-delay and dissipative coupling. On applying either type of coupling separately, we find that the presence of nonidentical heater powers can shrink the regions of amplitude death in both oscillators, while producing new regions of amplitude amplification in the weaker oscillator. We find that the magnitude of amplitude amplification grows with the heater power mismatch and with the total power input. These effects are also present when both types of coupling are applied simultaneously. This study highlights the critical role that nonidentical thermal loads can play in determining the amplitude response of coupled thermoacoustic systems, facilitating the design of control strategies for coupled oscillatorlike devices such as gas turbines.
我们通过数值模拟研究了两个不同的瑞利管中自激热声振荡的猝灭和放大，这两个瑞利管通过时间延迟和耗散耦合相互作用。单独应用任何一种耦合类型时，我们发现不同的加热器功率会缩小两个振荡器中振幅死亡的区域，同时在较弱的振荡器中产生新的振幅放大区域。我们发现，振幅放大的幅度随着加热器功率失配和总功率输入的增加而增大。当同时应用两种耦合类型时，这些效应也会出现。本研究突出了不同热负荷在确定耦合热声系统振幅响应中所起的关键作用，有助于设计诸如燃气轮机等耦合振子类设备的控制策略。
