燃烧器中双锥形喷口与双齿形环作用的研究

Study on the Effects of Double Conical Nozzles and Dual Gear Rings in the Burner

通过冷态流场试验和数值模拟,研究了双锥形喷口和双齿形环对旋流燃烧器喷口流场的速度分布、回流区特性及湍动度分布等空气动力场特性的影响.结果表明:双锥形喷口明显推迟了一、二次风的湍流混合,增强了一次风与中心回流区的混合;双齿形环增大了一次风速度以及一次风与其他气流混合的接触面积,内齿增大了中心管的尺寸,有利于中心回流区的形成;双锥形喷口和双齿形环都增大了流场的湍动度.

The influences of double conical nozzles and dual gear rings on the aerodynamic features such as velocity distribution, feature of return flow zone, turbulent intensity distribution, etc. were studied by cold state flow field test and numerical simulation. Results show that the double conical nozzle obviously delays the turbulent mixing of the primary air and the secondary air, and enhances the mixing between the primary air and the central return flow. The dual gear ring increases the velocity of the primary air and the contact area between the primary air and other air streams. The inner gear ring increases the size of the central air tube, which is helpful to form return flow zone. Both double conical nozzle and dual gear ring increase the turbulent intensity of the flow field.