本文以某改造汽轮机为背景，应用数值模拟以及理论计算的方法对低压缸排汽通

Based on the background of a modified steam turbine, this paper uses numerical simulation and theoretical calculation methods to study the exhaust steam passage of the low pressure cylinder, and analyzes the influence of the initial diffusion angle and outer diameter of the guide ring in the exhaust steam passage of the low pressure cylinder on the aerodynamic performance of the exhaust cylinder. influences. The results show that as the initial diffusion angle of the diversion ring decreases and the outer diameter of the diversion ring increases, the static pressure recovery coefficient of the exhaust cylinder will increase. When the initial diffusion angle is 15°, the outer diameter of the diversion ring The diameter is 5600mm, the streamline fits better with the diversion ring, the flow field distribution is stable, and the static pressure recovery coefficient is the largest; the optimization of the diversion ring structure can increase the static pressure recovery coefficient of low pressure exhaust steam by 37.1%, and the total pressure loss coefficient Reduced by 39%, the exhaust steam performance is better.

Based on the background of a modified turbine, this paper studies the low-pressure cylinder row strain channel using numerical simulation and theoretical calculation method, and analyzes the effect of the initial diffusion angle and outer diameter on the aerodynamic performance of the cylinder in the low-pressure cylinder liner channel. The results show that with the reduction of the initial diffusion angle of the deflector ring and the increase of the diameter outside the deflector ring, the static pressure recovery coefficient of the cylinder will be improved, and when the starting diffusion angle is 15 degrees, the outer diameter of the deflector ring is 5600mm, and the flow line It is better to fit with the conduction ring, the flow field distribution is stable, the static pressure recovery coefficient is the largest, and the optimization of the conduction ring structure can increase the static pressure recovery coefficient of the low-pressure exhaust ire by 37.1%, the total pressure loss coefficient is reduced by 39%, and the discharge performance is better.

In this paper, the influence of the initial diffusion angle and outer diameter of the guide ring on the aerodynamic performance of the exhaust channel of the low pressure cylinder is analyzed by using the numerical simulation and theoretical calculation methods. The results show that: with the decrease of the initial diffusion angle of the guide ring and the increase of the outer diameter of the guide ring, the static pressure recovery coefficient of the exhaust hood will be improved. When the initial diffusion angle is 15 °, the outer diameter of the guide ring is 5600 mm, the streamline fits the guide ring better, the flow field distribution is stable, and the value of the static pressure recovery coefficient is the largest; the optimization of the guide ring structure can make the static pressure recovery coefficient of the low-pressure exhaust steam The total pressure loss coefficient is reduced by 39% and the exhaust performance is better.