欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用数值模拟方法,对某涡轴发动机高压涡轮的其中一级进行了三维流场计算,通过对比分析均匀和非均匀间隙条件下的流场和气动参数分布,探讨了不同间隙形式时的叶顶泄漏流动情况、以及流场变化对涡轮级气动性能的影响。结果表明：随着间隙高度的增加,叶顶泄漏高损失区与上通道涡高损失区相结合,新的大尺度分离结构形成引起损失增加,当间隙高度为1.2 mm时的总效率降幅达到5个百分点;前缘附近间隙增加对损失的不利影响要小于尾缘,降低尾缘附近的间隙高度至0.3 mm可以有效提高总效率约1个百分点;通过控制叶顶不同区域的间隙高度,可以对间隙内泄漏流体速度进行有效控制,减小间隙内堵塞从而提高总性能。
英文摘要：
Three-dimensional numerical method was adopted to study the flow field and aerodynamic performance of a high pressure turbine stage of a turbo-shaft engine. The flow characteristics and aerodynamic parameters were compared under uniform and non-uniform tip clearance. The influence of tip leakage flow and the flow-field changes on dynamic performance of gas turbine with different gap forms was also discussed. The results show that the high-loss region closed to the tip gradually incorporates with the high-lose region of the upper passage vortex increased with the tip clearance. The new large scale separation structure leads to increased losses and the total efficiency reduces by 5% when the clearance height is 1.2 mm. Increasing the tip clearances near the leading edge has less adverse effect on loss than that of near the trailing edge. Reducing the tip clearance to 0.3 mm near the trailing edge can effectively improve the total efficiency about 1%. As a result, controlling the tip clearance in different regions of blade tip can effectively control the leakage flow rate and reduces blockage in the gap for improving the total performance in the gas turbine.
同期刊论文项目
同项目期刊论文
patial discretization error in an artificial benchmark model of oblique laser incidence by finite vo
Analysis on capabilities of density-based solvers within Open FOAM to distinguish aerothermal variab
A Second Order Radiative Transfer Equation and Its Solution by Meshless Method with Application to S
Analysis on transient conjugate heat transfer in gap–cavity–gap structure heated by high speed airfl
Numerical simulation of infrared signature emitted by liquid rocket plume using wide band k-distribu
Effect of air temperature on combustion characteristics and NOx emissions from a 0.5 MW pulverized c
Experimental study of the impact of holes-typesuction on the flow characteristics in a high-load com
First-principles molecular dynamics study on temperature-dependent dielectric function of bulk 3C an
Temperature-dependent dielectric function of germanium in the UV-vis spectral range: A first-princip
Characterization of combustion and NOx emissions with respect to over-fire air damper opening in a d
Simulation of flow behavior of particles bycluster structure-dependent drag coefficient model for ch
An effective inversion algorithm for retrieving bimodal aerosol particle size distribution from spec
Study of topology and vortex structure in turbinecascades with tip clearance under differentincidenc
Effect of the anthracite ratio of blended coals on the combustion and NOx emission characteristics o
Experimental study on the characteristics of heat transfer and flow resistance in a turbulent pipe f
Evaluation on cold modeling flow field for a down-fired 600 MWe supercritical boiler with multi-inje
Modeling of a rotational supercavitating evaporator and geometrical characteristics of supercavity i
Annaland Martin van Sint．Hans Kuipers, Dongsheng Wen, Discrete particle modeling of granular tempera
A de？ciency problem of the least squares ？nite element method for solving radiative transfer in stro
Simulation of flow behavior of particles by cluster structure-dependent drag coefficient model for c
Aerodynamic characteristics within a cold small-scale model for a down-fired 350 MWe supercritical u
Numerical simulation of natural convection in a square enclosure filled with nanofluid using the two
Inner and Outer Secondary-Air Distance-Effect Study within a Cold Small-Scale Model of a New Down-Fi
New over-fire air arrangement and its air ratio optimization determined by aerodynamic characteristi
Experimental Study of the Impact of Hole-type Suction on the Flow Characteristics in a High-load Com
Influence of Additional Leading-Edge Surface Roughness on Performances in Highly Loaded Compressor C
Investigation of Positively Curved Blade in Compressor Cascade Based on Transition Model (DOI: 10.15
期刊信息
位置：