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Experimental study of the possibility of reducing the resistance and unevenness of output field of velocities in flat diffuser channels with large opening angles

机译：减小大开口角平坦扩散器通道中速度输出场的阻力和不均匀性的可能性的实验研究

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In modern combined cycle gas turbines (CCGT), when designing the reducers from the output diffuser of a gas turbine to a boiler-utilizer, wide-angle diffusers are used, in which practically from the input a flow separation and transition to jet stream regime occurs. In such channels, the energy loss in the field of velocities sharply rise and the field of velocities in the output from them is characterized by considerable unevenness that worsens the heat transfer process in the first by motion tube bundles of the boiler-utilizer. The results of experimental research of the method for reducing the energy loss and alignment of the field of velocities at the output from a flat asymmetrical diffuser channel with one deflecting wall with the opening angle of 40° by means of placing inside the channel the flat plate parallel to the deflecting wall are presented in the paper. It is revealed that, at this placement of the plate in the channel, it has a chance to reduce the energy loss by 20%, considerably align the output field of velocities, and decrease the dynamic loads on the walls in the output cross-section. The studied method of resistance reduction and alignment of the fields of velocities in the flat diffuser channels was used for optimization of the reducer from the output diffuser of the gas turbine to the boiler-utilizer of CCGT of PGU-450T type of Kaliningrad Thermal Power Plant-2. The obtained results are evidence that the configuration of the reducer installed in the PGU-450T of Kaliningrad Thermal Power Plant-2 is not optimal. It follows also from the obtained data that working-off the reducer should be necessarily conducted by the test results of the channel consisting of the model of reducer with the model of boiler-utilizer installed behind it. Application of the method of alignment of output field of velocities and reducing the resistance in the wide-angle diffusers investigated in the work made it possible—when using the known model of diffusion reducer for PGU-450T, which is bad from the standpoint of aerodynamics— to reduce the value of the coefficient of the total loss by almost 20% as compared with the model of real reducer of PGU-450T.
机译：在现代联合循环燃气轮机（CCGT）中，当设计从燃气轮机的输出扩散器到锅炉利用器的减速器时，使用了广角扩散器，其中实际上是从输入处进行流分离并过渡到射流状态发生。在这样的通道中，速度场中的能量损失急剧上升，并且它们的输出场中的速度场的特征在于明显的不均匀性，该不均匀性首先使锅炉利用器的运动管束恶化了传热过程。通过将平板放置在通道内部来减少能量损失和减少带有一个偏转角为40°的偏壁的不对称扩散器通道输出的速度场对准方法的实验研究结果本文提出了与偏转壁平行的结构。结果表明，通过将板放置在通道中，可以将能量损失降低20％，显着对齐速度的输出场，并减小输出横截面上壁上的动态载荷。 。研究的电阻降低方​​法和扁平扩散器通道速度场的对准方法用于优化从燃气轮机输出扩散器到加里宁格勒热电厂PGU-450T型CCGT锅炉利用器的减速器-2。获得的结果证明安装在加里宁格勒热电厂2的PGU-450T中的减速器的配置不是最佳的。从获得的数据还可以得出，必须对包括减速器模型和安装在其后的锅炉利用器模型组成的通道的测试结果进行减速器的检修。在工作中研究的速度输出场对准方法和减小广角扩散器中阻力的方法的应用使之成为可能—当使用已知的PGU-450T扩散减小器模型时，从空气动力学的角度来看这是不好的—与PGU-450T的实际减速器模型相比，将总损耗系数的值减小了近20％。

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