轮毂及隔板型式对旋转冲压压缩转子性能的影响研究

发布时间：2018-11-21 15:48

【摘要】：为了提高燃气轮机的性能,超／跨声速压气机的研制至关重要。旋转冲压压缩转子是一种通过激波对来流进行压缩的新型超声速压气机转子,具有单级压比高、结构简单、重量轻、体积小等优点。为了提高旋转冲压压缩转子的整体性能,获得不同轮毂及隔板型式对流道内部流动的影响机理,本文通过改变轮毂及隔板型式获得不同改型方案,并采用数值方法对具有不同轮毂及隔板型式的改型方案进行数值研究。首先,针对旋转冲压压缩转子轮毂型式进行改型,通过改变压缩面、扩压面沿流向形状以及综合改变轮毂型式获得不同改型方案,并对它们进行数值研究。研究结果表明：适当改变压缩面的沿流向形状可以达到改变激波形态,进而减小激波损失的效果,但并不能明显提升旋转冲压压缩转子的整体性能；扩压面沿流向的形状对旋转冲压压缩转子的性能有一定的影响,在长度相同的情况下,随着初始扩压角的减小,转子的增压比、效率等整体性能会有一定的提升,但是整体提升并不明显；在初始扩压角相同的情况下,增加承压段的长度可以提高旋转冲压压缩转子的增压比,而增加扩压面的长度可以提高其效率以及总压恢复系数；针对轮毂型式局部改型并不能明显提高旋转冲压压缩转子的整体性能。其次,针对旋转冲压压缩转子隔板型式进行改型,通过改变隔板前段、后段以及综合改变隔板型式获得不同改型方案,并对它们进行数值研究,研究发现：改变隔板前段型式可以改变隔板前缘激波,进而改变旋转冲压压缩转子的进气流量和来流品质、提升旋转冲压压缩转子的增压能力并减小流道内部流动损失,对于提升旋转冲压压缩转子的整体性能有着积极的影响；改变隔板后段型式,主要可以改变旋转冲压压缩转子左隔板出口处的分离状况,且随着尾缘起始点的后移,各方案的分离状况逐渐得到改善,但是在尾缘起始点后移过程中存在一个增压能力最大点,超过这一点气流则会在右隔板出口处产生膨胀,严重影响旋转冲压压缩转子的增压能力,此外,左隔板向流道内部折转也可以获得较好的改型；在充分考虑隔板前段及隔板后段对旋转冲压压缩转子的影响,并保证隔板强度的情况下对隔板进行综合改型可以获得较优的改型方案。
[Abstract]:In order to improve the performance of gas turbine, the development of supersonic / transonic compressor is very important. Rotary press compression rotor is a new type of supersonic compressor rotor which compresses the incoming flow by shock wave. It has the advantages of high single-stage pressure ratio, simple structure, light weight, small volume and so on. In order to improve the overall performance of rotary press compression rotor and obtain the influence mechanism of different wheel hub and partition type on the flow inside the runner, different modification schemes are obtained by changing the wheel hub and partition type. Numerical method is used to study the modification scheme with different wheel hub and partition type. Firstly, different modification schemes are obtained by changing the compression surface, changing the shape of the diffuser along the flow direction and synthetically changing the hub type. The results show that changing the shape of compression surface along the direction of flow can change the shape of shock wave and reduce the loss of shock wave, but it can not obviously improve the overall performance of rotary press compression rotor. The shape of the flow direction of the diffuser surface has a certain influence on the performance of the rotary press compression rotor. When the length is the same, with the decrease of the initial expansion angle, the overall performance of the rotor, such as the booster ratio, the efficiency and so on, will be improved to a certain extent. But the whole ascension is not obvious; Under the condition of the same initial expansion angle, increasing the length of the bearing section can increase the booster ratio of the rotary stamping compression rotor, while increasing the length of the diffuser surface can improve the efficiency and the total pressure recovery coefficient. Local modification of hub type can not obviously improve the overall performance of rotary press compression rotor. Secondly, different modification schemes are obtained by changing the front and back segments of the baffle and synthetically changing the type of the diaphragm of the rotary press compression rotor, and the numerical study is carried out on them. It is found that changing the type of the front section of the baffle can change the shock wave of the front edge of the diaphragm, and then change the inlet air flow rate and the incoming flow quality of the rotary punching compression rotor, enhance the pressurization capacity of the rotary punching compression rotor and reduce the flow loss inside the channel. It has a positive effect on the overall performance of rotary press compression rotor. The separation condition at the outlet of the left septum of the rotary press compression rotor can be changed by changing the type of the posterior section of the partition, and the separation condition of each scheme is gradually improved with the moving back of the starting point of the tail edge. However, there is a maximum supercharging capacity point in the process of moving backward at the starting point of the tail edge, beyond which the airflow will inflate at the outlet of the right diaphragm, which will seriously affect the turbocharging capacity of the rotary press compression rotor. A good modification can also be obtained by folding the left partition into the inner of the runner. Under the condition of considering the influence of the front and back section of the diaphragm on the rotary press compression rotor and ensuring the strength of the partition board, a better modification scheme can be obtained by comprehensive modification of the partition plate.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK473

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