Aerothermal characteristics of a transonic tip flow in a turbine cascade with tip clearance variations

Gao, Jie; Zheng, Qun; Niu, Xiying; Yue, Guoqiang

doi:10.1016/j.applthermaleng.2016.06.155

Cited by 33 publications

(11 citation statements)

References 33 publications

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“…In this research Shear-Stress Transport (SST) -turbulence model proposed by Menter is used to acquire the features of unsteady flow in CFD calculation. SSTturbulence model can yield more accurate and reliable results for simulating flows with adverse pressure gradient [14], flows around complex geometry [15], transonic flows [16], and so forth. Equation for SST -turbulence model is expressed as follows [17][18][19]:…”

Section: Basic Theory and Methodsmentioning

confidence: 99%

Numerical Investigation of the FSI Characteristics in a Tubular Pump

Wang

Zhang

Yin

2017

Mathematical Problems in Engineering

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Flow condition was simulated in a shaft tubular pump by using the Shear-Stress Transport (SST) k-ω turbulence model with high quality structured grids in design condition. Corresponding structural vibration characteristics were then analyzed based on two-way coupled Fluid-Structure Interaction (FSI) method. Fluid results showed that flow in the outlet flow passage was a combination of the axial flow and circumferential rotation motion. Time and frequency domain analysis of pressure pulsation of typical measure points indicated that larger pulsation amplitudes appeared in the tip of the blades and the main vibration source was the pressure pulsation induced by rotation of the blades. The fluid pulsation amplitudes decreased gradually along the flow direction, which can be ascribed to the function of fixed guide vane. Structural analysis of the blades in both pressure and suction side indicated that significant stress concentration was formed at the blade and hub connection near the leading edge. Maximum effective stress of the blades varied periodically, so prevention measures of the fatigue of blades should be taken. This research can provide important reference for the design of the tubular pump.

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Section: Basic Theory and Methodsmentioning

confidence: 99%

Numerical Investigation of the FSI Characteristics in a Tubular Pump

Wang

Zhang

Yin

2017

Mathematical Problems in Engineering

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“…Zou et al 6 studied the dominant flow structure near the squealer tip and its impact on turbine aerodynamic performance numerically. Gao et al 7 reported the effect of tip clearance variations on aerothermal characteristics of a transonic turbine tip. Zhou and Hodson 8 numerically studied the effect of squealer thickness and squealer height on the aerothermal performance of tip leakage flow.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty quantification of the effects of squealer tip geometry deviation on aerothermal performance

Shi

Chen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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The first-stage rotor squealer tip is a key area in gas turbine for both aerodynamic performance and blade cooling tasks, which should be carefully designed. However, harsh operating conditions near the rotor squealer tip can cause the geometry of the squealer tip to degrade, and manufacturing inaccuracies can also cause the squealer tip geometry to deviate from the ideal design. These geometry deviations would change the flow field near the blade tip, which will influence the thermal and aerodynamic performance. Thus, it is important to quantitatively investigate the effects of squealer tip geometry deviation on the aerothermal performance. In this paper, a typical transonic first-stage turbine is employed, and three important geometric features of squealer tip, the tip clearance height (H), the squealer depth (D), and the squealer edge chamfer (R), are selected. An uncertainty quantification process is performed to study the effect of deviation of H, D, and R on the aerothermal performance. Many cases with different geometry features are checked in the current study using 3D Reynolds-averaged Navier–Stokes simulations. A parameter sensitivity analysis using Sobol Indice method is carried out to identify the key parameters to aerothermal performance of the squealer tip. The uncertainty quantification results show that the existence of the tip chamfer reduces the size of separation bubble and the dwelling range of the scraping vortex, thus, the blockage effect of the leakage flow is weakened, which results in larger amount of leakage flow and more mixing loss of squealer tips with edge chamfer than those without edge chamfer. The results of the parameter sensitivity analysis show that the height of tip clearance is the main factor that affects the aerodynamic performance of the squealer tip. This work provides a certain guiding direction for the optimization design of the turbine groove tip.

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“…For instance, Gao et al. 4 investigated the sensitivity of the aerothermal performance of transonic tip leakage flow with various tip gaps in a RT27a turbine cascade and showed that the tip clearance increase delays the shock wave reflection but makes the shock more evident. Arisi et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the aerodynamic performance and excitation forces in a transonic turbine cascade with flat-tip and squealer-tip blades

Pan

Yuan

Huang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The purpose of this paper is to numerically investigate the effect of blade tip clearance and its structure on the turbine aerodynamic performance and excitation force on blades in a transonic turbine cascade. Hence, circular cascades with flat-tip and squealer-tip blades and eight different tip clearances based on the SNECMA transonic turbine were established and the rotational effect was taking into consideration. The simulations were performed by solving the RANS equations and the SST turbulence model was used. The results show that tip clearance and tip structure have a significant influence on the turbine efficiency and excitation forces. Smaller tip clearance and squealer tip structure can reduce the tip leakage flow and leads to higher turbine efficiency. The tangential blade force varies nonlinearly with tip clearance since the leakage flow significantly changes the static pressure distributions on blade surfaces. Further, the excitation force factor was also calculated and illustrated.

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Aerothermal characteristics of a transonic tip flow in a turbine cascade with tip clearance variations

Cited by 33 publications

References 33 publications

Numerical Investigation of the FSI Characteristics in a Tubular Pump

Numerical Investigation of the FSI Characteristics in a Tubular Pump

Uncertainty quantification of the effects of squealer tip geometry deviation on aerothermal performance

Numerical analysis of the aerodynamic performance and excitation forces in a transonic turbine cascade with flat-tip and squealer-tip blades

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