Casing treatment is an effective passive technology for improving the compressor stability. However, current design methods casing rely excessively on trial and error experiences, presenting significant challenges to actual engineering applications. In this paper, we propose a multi-objective optimization method based stall margin evaluation data mining enhance stability of axial rotors. We have developed platform that combines geometric parameterization, mesh generation, numerical...

In the development of compressor, one-dimensional (1D) analysis is indispensable as it can quickly determine basic parameters and predict characteristics compressors. To enhance accuracy 1D analysis, genetic algorithms comparison methods are used to obtain calculation coefficients for deviation angle, work, efficiency in empirical models. An eight-stage axial compressor was chosen optimization validation. At 90% 100% design speeds, results with applying closely match characters experimental...

Abstract The performance prediction accuracy of quasi-3D design is highly dependent on the empirical correlation model. state art model from experimental data hard to meet request new blade development and higher aerodynamic demand. In order solve problem by ignoring influence thickness position Reynolds number correction model, numerical research based middle section low-pressure compressor rotor conducted. sample database constructed a uniform sampling method considering incidence,...

The cross-flow perpendicular to the inviscid main flow in boundary layer has potential instability, causing transition from laminar turbulent flow. In order explore mechanism of blade on transition, this paper studies rectangular cascade a certain compressor stator blade. Large eddy simulation calculations and display experiments for six attack angles with end wall cascades were carried out. It is found that disturbance dominated by two-dimensional Kelvin–Helmholtz (K–H) instability. begins...

Abstract The improvement of aero-engine performance has posed a serious threat to aeroelastic stability, thereby compromising the reliability aero-engines. An effective approach quantify risk compressor blade instability and enhance stability is through flutter probability evaluation. This study proposes prediction method called Particle Swarm Optimization-Deep Extremum Neural Network model (PSO-DENN) improve modeling accuracy computational efficiency analysis in Through deterministic...

The research on geometric parameters of casing treatment (CT) has always been a hot topic, yet the multi-parameter interaction is rarely studied. In order to gain better knowledge mechanism CT, experimental and numerical study based response surface method carried out in an axial compressor rotor. First all, statistical analysis database results presented summarize influence law varied stability enhancement. It was found that overlap, open area ratio, their had most significant enhancement...

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

The aerodynamic sound from bluff bodies is a practically important problem in various engineering applications. To control the noise, emitted circular cylinder with and without splitter plate Reynolds number (Re) of [Formula: see text] studied using Ffowcs Williams Hawkings (FW-H) acoustic analogy. flow field simulated by Detached Eddy Simulation (DES) approach to investigate mechanism reduction three-dimensional calculation. predicted compared experimental data literature, good agreement...

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Abstract With the help of dynamic mode decomposition (DMD) analysis, unsteady effects casing treatment on tip flow structures in a subsonic compressor rotor were numerically studied. Taking change geometric parameters into account, frequency characteristics and modes compared discussed, for further revealing stability enhancement mechanism treatment. At smooth casing, analysis showed that dominated by high absolute values alternately emerging along passage streamwise, which is consistent...

In this paper, the three dimensional single-channel numerical simulation has been undertaken to analyze unsteady flow characteristic and fluctuation mechanism at near stall condition in a transonic compressor rotor. It found that condition, strong fluctuations appeared region which is closed pressure surface (PS) leading edge downstream of shock wave rotor tip. Then, detailed analysis tip field showed interaction between leakage vortex (TLV) waves causes spiral type breakdown TLV,and caused...

Casing treatment and three-dimensional blade design are effective techniques to remedy the deficiency of compressor stability margin, yet their combined effects on performance seldom studied. With help URANS simulations, this paper explored influence aerodynamic sweep casing in a transonic rotor. Compared with configurations single treatment, configuration presented an outstanding advantage for improving performance. For overall performance, stall margin improvement was up 11.8%, larger than...

This paper presents detailed numerical analysis of shallow reversed blade-angle slots casing treatment(RSCT) in a transonic axial compressor stage operating at design and off-design conditions. Previous studies have shown that the present rotor is tip-typical suitable for use treatment to improve flow stability enhance stall margin. The unsteady simulations are performed with three-dimensional time accurate Favre-averaged Navier-stokes solver. results solid demonstrate initiated from tip...

Aiming to reveal the influence mechanism of casing treatment on rotor tip flow structure, unsteady numerical method was used study effects slot-type (SCT) in a transonic compressor. The results showed that field appeared obvious periodic characteristics with SCT at smooth near stall condition. When rear edge slot passed through pressure surface, leakage kinked and sucked into slots, yet significantly weakened when suction surface. Meanwhile, patterns slots change periodically variation...