With the increase of blade loading, the loss prediction model used in the design process needs refinement and improvement to meet the high-performance design. For the turbine design, most of existing profile loss models are developed for subsonic and transonic cases and their accuracy in high Mach number flow are lim...
Enhancing stall margin has a great importance for the development of turbo compressors. The application of circumferential grooved casing treatment (CGCT) is a useful method of increasing the stable operating range of the compressor, and the effectiveness of this kind of casing treatment have been proved by numerous ...
Casing treatment (CT) has the potential to extend the stable operating range of a centrifugal compressor. A multi-objective optimization method is proposed to optimize the CT of centrifugal compressors. The method consists of Kriging metamodel, Genetic Algorithm (GA), data-mining techniques and CFD code. Firstly, dat...
为探索叶片非均匀布置对多翼离心风机性能和噪声的影响,本文采用叶片沿叶轮周向正弦分布和随机分 布两种方式设计五种叶片非均匀分布方案。基于非均匀叶片对风机通过频率的调节,通过数值模拟和气动性能试 验的对比分析,得出了非均匀调制程度和方式对风机气动性能的影响规律,并对不同方案进行了噪声性能试验。 结果表明:当叶片非均匀程度相对变化...
蜗舌作为多翼离心风机蜗壳的重要组成部分对风机的气动性能和噪声有着重要的影响。本文针对吸油烟 机用多翼离心风机蜗舌进行了改型设计,获得了一种新型的圆弧蜗舌结构。采用数值计算方法对原型风机和带有 新型圆弧蜗舌的风机流场特性和气动噪声进行了对比分析。基于实验测量,验证了多翼离心风机气动性能数值模 拟结果的有效性。研究结果表明:圆...
The modern gas turbine engine has been used in current power generation industry for almost half a century. Gas turbines are designed to operate with the best efficiency during normal operating conditions and at specific operating points. However, the real world is non-optimal and the engine may have to operate at of...
Today the Organic Rankine Cycle (ORC) is considered as one of the most promising technologies to recover the power from low- grade heat resources. In order to realize a high performance ORC turbine, the Computational Fluid Dynamics (CFD) is extensively used to simulate the internal flow in the aerodynamic design. But...
The challenging conditions at which gas turbine engines operate mean that careful management of component temperatures is necessary, in order to ensure component integrity and reasonable service life. Pressurised flows extracted from the compressor can be used for cooling, sealing and balancing of components througho...
Environmental pressures and economic requirements have led to a drive to ever increasing steam parameters to further increase steam turbine cycle efficiencies. This poses a number of challenges: plant architecture, steam turbine design and turbine material requirements. GE has been developing USC technology for more ...
离心压缩机叶轮结构设计需要同时兼顾气动性能和结构强度要求。本文研究了考虑气动性能要求下的叶 轮结构应力优化方法。通过Bezier曲线拟合叶轮子午面形状,采用叶片型线的安放角和叶片厚度控制叶片三维形 状。通过径向基函数建立叶轮几何控制参数对叶轮多变效率、叶轮压比、叶片最大应力的模型,采用CORS- BRF约束优化算法求解优化问题。优化结...
针对压缩机管壳式换热器中细长换热管在管程流体激振下产生的横向振动问题,采用多跨梁理论进行动 力学建模。以管程流速为参数,建立了横向振动微分方程,采用简便易行的传递矩阵法求解,得到了换热管的自振频率,以及使横向振动失稳的管程流动临界流速。通过算例验证了方法的求解精度,指出在失稳临界流速较大 时,设计时可将管程流体简化为管材的附...
叶片的振动及其导致的疲劳断裂问题一直是限制透平机械向大型高参数化方向发展的主要障碍,对叶片裂纹进行及时诊断预警是防止事故的重要手段。本文研究通过启停车数据进行叶片裂纹故障诊断的方法,提出基于非线性最小二乘拟合和AR方法相结合的基于叶片同步振动的叶片状态参数精确辨识方法,准确捕捉叶片的固有频率,通过固有频率的变化辨别叶片裂纹...
重型发电燃机的转子以盘式拉杆转子结构形式为主,因此研究拉杆转子的动力学特性对于保障燃机转子安全运行具有实际意义。拉杆转子的动力学特性既受到拉杆预紧状态影响,也受到转子两端边界状态影响。以盘式拉杆转子试验台结构为对象,对转子在连接电机和不连接电机两种状态下进行试验模态分析,测试计算了两种状态下的转子固有频率和模态振型,对比...
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