Azimuthal forcing has been applied to flames in a laboratory scale annular combustor in order to accurately control the azimuthal mode of excitation. A new forcing configuration permitted not only the pressure amplitude, but also the spin ratio and mode orientation to be accurately controlled, in order to generate standing modes and for the first time strong spinning modes in both a clockwise (CW) and anti-clockwise (ACW) direction. The phase averaged heat release dynamics of these modes was compared and a number of differences observed depending on the direction of pressure wave propagation, demonstrating characteristic ACW and CW heat release patterns. A new spin compensating averaging method was then introduced to analyse the flame dynamics, and it was shown that through the application of this method the dynamics of standing wave oscillations could be decomposed to recover the characteristic ACW and CW heat release responses. The global heat release response was also assessed during strongly spinning modes, and the magnitude of the response was shown to depend strongly on the direction of propagation, demonstrating the importance of the local swirl direction on the global heat release response, with important implications for the modelling of such flows.

方位角强迫已在实验室规模的环形燃烧器中应用于火焰，以精确控制激发的方位角模式。一种新的强制配置不仅允许精确控制压力幅度，而且还可以精确控制旋转比和模式方向，以生成直立模式以及首次在顺时针（CW）和逆时针（ ACW）方向。比较了这些模式的相位平均放热动力学，并观察到了许多与压力波传播方向有关的差异，从而证明了ACW和CW的特征性放热模式。然后引入了一种新的自旋补偿平均方法来分析火焰动力学，结果表明，通过该方法的应用，可以分解驻波振荡的动力学，以恢复特征性的ACW和CW放热响应。还对强旋转模式下的整体放热响应进行了评估，并且该响应的大小在很大程度上取决于传播方向，这说明了局部旋流方向对整体放热响应的重要性，这对整体放热响应具有重要意义。此类流程的建模。