The variable geometry turbine (VGT) adjustable guide vane (AGV) is a key component in next-generation cycle engines, with its flow control capability and aerodynamic performance playing crucial role the overall engine performance. AGV controls capacity by rotating blade angle, which inevitably results tip clearances at both ends of blades. In this study, rationality clearance setting on sides sector cascade experiment systematically studied, influence effect periodicity parameters field...

Numerical simulation is performed to explore leading film cooling enhancement by the application of injecting water mist into air. The accuracy numerical program for conjugate heat transfer methodology verified with C3X gas turbine vanes cooled edge films. effect various parameters including concentration, diameter, different particle wall interactions conditions, and forces on improvement performance investigated in this paper. It indicates that can decrease temperature boundary layer...

Variable geometry turbines are widely employed to improve the off-design performance of gas turbine engines; however, there is a penalty associated with vane-end partial gap required for movement variable vanes. This paper continuation previous work and aims understand leakage flow loss mechanisms under influence pivoting axis. Experimental investigations linear cascade have been conducted tip heights 1.1% 2.2% blade spans as well setting angles −6°, 0°, 6°, so reveal three-dimensional...

A highly loaded design method of helium compressor is presented in this paper. First, particular loss prediction models based on corrections isentropic index and velocity triangle are deduced for compressor. Then the influence parameters such as reaction, flow coefficient load aerodynamic analyzed detail with models. The principles also discussed. study carried out a 300-MW high-temperature gas-cooled reactor (HTGR) multistage to validate method. results indicate that 16-stage low-pressure...

Numerical research on lifting and sealing performance of a whole ring finger seal with grooved pad structures is presented in this paper. Different groove the bottom pad, such as one two straight grooves, or herringbone grooves different gradients, etc., will be simulated. For discussing interaction between rotor seal, vibration trajectory taken into account numerical computation. simulation results indicate that complete model more suitable than an individual to simulate fluid–solid...

The simulation of thermal–fluid–solid coupling in turbines is critically important for design optimization. Historically, most research on has been conducted three-dimensional, often with computational speeds that do not meet practical expectations. This study proposes a one-dimensional performance prediction and multi-objective optimization methodology turbines, integrating aerothermodynamics structural strength, to facilitate rapid multidisciplinary at low-dimensional level. Initially,...

To rotate the vane of variable geometry turbine, end walls contours turbine have to be spherical. If are cylinders, there will nonuniform clearances between ends and walls. In these two cases, flow fields rotated vanes simulated compared. Special attentions paid flows in spherical under four rotating angles. The leakage loss investigated analyzed this paper.

The losses caused by the leakage flows through rotor tip clearance, and mixing re-entering into main flow are considerable parts of total in turbines. reason for is different velocity components flows. This leads to shear stresses which cause increased turbulence losses. article presents a numerical investigation on three configurations control flows: (a) turning vanes fixed onto casing between fins turn shroud direction order reduce circumferential losses; (b) honeycomb bands inserted...

Variable geometry turbine exists in small mobile gas turbines or some marine to enhance the part-load performance. However, there are efficiency penalties associated with vane partial gap, which is needed for movement of variable vanes. This paper investigates vane-end clearance leakage flow a flat tip, cavity winglet tip passive injection, and cavity-winglet assess possibility minimizing losses cascade. First, calculations were done at test rig conditions comparison measured data, they used...

Rotor dynamics and flow characteristics are computed for a honeycomb seal corresponding labyrinth seal. Firstly, rotor dynamic parameters, such as amplitude frequency of vibration calculated. Then these parameters used unsteady fluid computation. Numerical results indicate that the can reduce sealing performance result in additional aerodynamic force on rotor. Further, forces tend to self-excited rotor, this effect becomes more apparent with increase pressure difference. Vortex cavities is...

Variable geometry turbines are widely used to improve the part-load performance of gas turbine engines. However, there is a penalty associated with vane-end clearance required for movement variable vanes. Especially high casing-endwall angles, greater clearances necessary due annulus slope, and then endwall leakages would occur, which further deteriorates efficiency. The design first stage stator vane in four-stage power featuring very angles has been carried out by proposed stepped...

Abstract The variable geometry turbine (VGT) has been widely used in different fields due to its higher efficiency and lower fuel consumption at part-load. However, the flow field a VGT is characterized by leakage through radial clearance of rotational vane compared with general fixed turbine. Numerical simulations are conducted on linear cascade reduce based passive control method. aerodynamic performances for four kinds tip configuration firstly. Then, effect performance investigated five...

The idea of utilizing a finely dispersed water-in-air mixture has been proven to be feasible technique produce very high cooling rates. accuracy numerical simulation program for conjugate heat transfer methodology is verified with the Mark II transonic pressure turbine stator which cooled by internal convection through radial round pipes, and different turbulence models transition are employed analyze influence on results. On basis it, mist simulated under typical gas operating conditions...

In this paper, the idea of utilizing finely dispersed water-in-air mixture in swirl channel to cool leading edge a turbine blade is proposed and investigated. The computational techniques are verified results compared with dry air experimental data. Heat transfer enhancement achieved by application mist injection cooling configuration that modified from well-known C3X airfoil. indicate can take full advantage addition. effects parameters, such as concentration, diameters, inlet temperature...

A comparative study of the flow field and heat transfer characteristics between swirl impingement mist/air cooling on blade leading edge is carried out to find a better configuration for phase transition cooling. The Eulerian–Lagrangian particle tracking technique used investigate Comparisons are made these two forms in such aspects as vortex structure, enhancement, pressure loss, thermal uniformity with without mist injection. influences ratio Reynolds numbers parameters studied this paper....