Impact of Falling Blocks of High Pressure Turbine Rotor Blades With Squealer Tip on the Aerodynamic Performance and Vibration Characteristics

doi:10.12096/j.2096-4528.pgt.24094

Abstract

Abstract:

Objectives The operating state under the condition of high-pressure turbine damage will have a certain impact on the performance and vibration of the gas turbine. At present, the means to accurately assess whether the whole machine can continue to be in service was relatively lacking. Therefore, the research on the influence of the tip groove wear and block shedding of the high-pressure turbine rotor blade on the aerodynamic performance and vibration deformation had been carried out. Methods Using the three-dimensional numerical simulation method, based on the original tip groove structure of the blade, the influence of five different tip groove damage shapes on typical aerodynamic performance and vibration characteristics of the high pressure turbine was simulated and analyzed. Results The damage of the blade tip groove on the pressure side with falling block, suction side with falling block, trailing edge with falling block, pressure side and trailing edge with falling blocks simultaneous, or pressure side, suction side and trailing edge with falling blocks simultaneous of rotor blades cause an efficiency decrease of 0.44%, 1.6%, 0.03%, 0.67%, and 3.2%, respectively. Different blade squealer tip shapes have a smaller impact on the vibration deformation of the rotor blade, while trailing edge with falling block reduces the deformation of the rotor blade. Conclusions Based on the analysis results of comprehensive performance and vibration, rotor blades with falling blocks at pressure side, trailing edge, or both can continue to be used. However, it is not recommended to use rotor blades with falling blocks at suction side or pressure side, suction side and trailing edge.

Key words: gas turbine, high pressure turbine, leakage flow, numerical simulation, rotor tip, vibration response

CLC Number:

TK 05

Mingyang ZHAO, Linlin YIN, Wentao WEI, Yun CHEN, Richen LIU, Jun LI. Impact of Falling Blocks of High Pressure Turbine Rotor Blades With Squealer Tip on the Aerodynamic Performance and Vibration Characteristics[J]. Power Generation Technology, 2024, 45(5): 856-867.

Figures/Tables 20

Fig. 1 Diagram of falling blocks of rotor blade tip flutes

Fig. 2 Diagram of the models

Tab. 1 Parameters of the turbine

参数	数值
涡轮级进出口总静压比	4.9
动叶展弦比	1.19
动叶稠度	1.22
动叶出口马赫数	0.57
动叶叶尖凹槽深度/mm	4
动叶叶尖最小间隙/mm	0.5
动叶出口轮毂比	0.88

Fig. 3 Calculation model

Fig. 4 Relative static pressure distribution on the rotor surface

Fig. 5 Distribution of outlet flow angle along the blade height

Fig. 6 Distribution of flow angles along the circumference at different outlet heights

Fig. 7 Streamlines at different outlet heights

Fig. 8 Leakage flow rate at rotor tip clearance

Fig. 9 Mach number cloud map and streamline distribution at different planes

Fig. 10 Distribution of reaction

Fig. 11 Curves of rotor total pressure loss coefficient

Fig. 12 Total pressure cloud map and streamline distribution at the outlet section

Fig. 13 Relative efficiency curve

Fig. 14 Frequencies of rotor blade

Fig. 15 Campbell diagram

Fig. 16 Directional deformation of rotor blade A-F

Fig. 17 Directional deformation of rotor blade

Fig. 18 Schematic diagram of calculation model for fallings blocks of some rotor blade tip flutes

Fig. 19 Impact of some falling blocks on efficiency

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