To accurately predict the matching relationships between various components and engine performance in whole aero-engine environment, this study introduces a two-dimensional throughflow simulation method for aero-engine. This is based on individual solvers turbo-machinery combustor. It establishes model by integrating with compressor-turbine co-operating equations boundary conditions. The solver employs circumferentially averaged form of time-dependent Navier–Stokes (N-S) as governing...

An experimental study was conducted in the present to investigate effects of upstream probe disturbance on compressor cascade performance. The experiments were carried out using a plane test facility where aerodynamic coupling mechanisms between inner and particularly evaluated terms complex reversed pressure gradient. Moreover, influence install position near leading edge downstream flow characteristic detail. Results show that presence at can reduce total recovery coefficient, raise wake...

To conduct high-precision and high-resolution numerical simulation of complex flow structures in turbomachinery, a high-order finite volume weighted essentially non-oscillatory (WENO) scheme for the large eddy (LES) is improved embedded into three-dimensional viscous unsteady CFD solver NUAA-Turbo. Firstly, spectral characteristics convergence WENO are studied. Compared with classical scheme, has better dissipation dispersion faster speed. Then, coefficient CW Wall-Adapting Local...

The characteristics of unsteady flow in a dual-flowpath inlet, which was designed for Turbine Based Combined Cycle (TBCC) propulsion system, and the control methods were investigated experimentally numerically. It characterized by large-amplitude pressure oscillations traveling shock waves. As inlet operated supercritical condition, namely terminal located throat, oscillated, period oscillation about 50 ms, while amplitude 6 mm. caused separation diffuser. This can be controlled extending...

The temperature of flow at the combustor exit is inherently non-uniform and hot fluid called hot-streak. An in-house CFD software, NUAA-Turbo, was used to carry out 3D unsteady simulations on PW-E3 single-stage high-pressure turbine. hot-streak effect based real stator counts approximately evaluated by contraction/dilatation method interface. attenuation migration process hot-streaks in turbine passage were well captured. general performance parameters for different circumferential positions...

Abstract Aiming at resolving the problem of measuring probe blockage effect in performance experiments high loaded axial flow compressors, an experimental investigation support disturbance on compressor cascade field was conducted a transonic plane test facility. The influence characteristics tail structure downstream under different operation conditions were revealed through detailed analysis data. results show that aerodynamic coupling between upstream wake and is very intense. Some...

In order to understand the physical phenomenon of reflected shock/turbulent boundary layer interaction, Large Eddy Simulation (LES) is conducted investigate shock wave and turbulent interaction in a 12° compression ramp with inlet high Mach number 2.9. Rescaling/recycling method used as inflow turbulence generation technique validated on supersonic flat plate layer. The flow field recycling plane computation domain obtained give condition for LES computation. This paper focuses region, where...

Abstract The physical characteristics of self-sustain shock oscillation and the key factors that affect in turbine-based combined-cycle(TBCC) inlet were investigated through unsteady numerical simulation method this paper. terminal throat was caused by separation bubble appeared lower wall turbojet flowpath. angle splitter offset diffuser main which oscillation. When increased from 0 deg to 12 deg, frequency 100Hz 133Hz; while when it greater than 18 phenomenon disappeared. Different motion...

There are a variety of purpose measuring the weight with different readability and capacity weighing system, such as using in daily life, large instrument or laboratory dedicated high-precision digital instrument. This report introduces kind apparatus, for liquid viscosity. The target system is very sensitive, at 0.1 mg, which requires every step making this device minimizes error. Therefore, needs to use sensor, 24-bit analogue converter HX711, Arduino Uno, compact lightweight series board,...

As the core equipment of power generation system, a gas turbine is an indispensable energy-converting device in national industry. The flow inside high-pressure (HPT) highly unsteady, which has great influence on aerothermal performance and structural strength. To better clarify mechanism guide advanced design, basic characteristics transonic turbines are investigated paper by modified scale-adaptive simulation (SAS) model based shear stress transport (SST) turbulence model. numerical...

ABSTRACT The pressure oscillation and terminal shock motion in a two dimensional inlet, which was designed for tandem configuration turbine-based combined cycle propulsion systems investigated experimentally numerically, respectively. inlet characterised by bleed cavity upstream the throat, an S-shape rectangular-to-circular diffuser flowpaths turbine ramjet engine. calculated through second-order unsteady Reynolds-averaged Navier-Stokes scheme. were when operated at different conditions....

In numerical simulations, achieving high accuracy without significantly increasing computational costs is often challenging. To address this, this paper presents an improved finite volume weighted essentially non-oscillatory (WENO) scheme tailored for applicability in fluid dynamics (CFD) and implemented the flow solver NUAA-Turbo simulating turbomachinery flows using both RANS RANS/LES coupling. Firstly, new WENO validated against classic test cases to assess its stability reliability...

To achieve high-fidelity large eddy simulation (LES) predictions of complex flows while keeping computational costs manageable, this study integrates a high-order WENO-ZQ scheme into the LES framework. The has been extensively studied for its accuracy, robustness, and cost in inviscid flow applications. This extended to viscous by integrating it three-dimensional structured grid CFD solver. High-fidelity simulations turbulent boundary layer supersonic compression ramp were conducted, with...

To improve the aerodynamic characteristics of compressor blades, a novel asymmetric leading edge (ASYLE) has been introduced and shown to offer superior performance. However, robustness such specially designed (LE) remains unclear due considerable uncertainty problems it presents. This paper investigates ASYLE blade under both geometric operational uncertainties. Profile deviations within ±0.05mm were investigate influence manufacturing errors. In addition, perturbated inflow angles between...

Abstract To investigate the mechanism of cavitation, a mathematical model cavitation region and an expression for gas volume fraction in inner hole rotating cavitator are developed. Then, based on realizable k -ε turbulence Schner & Sauer model, flow field is simulated numerically. With help pressure streamlined distribution contours, velocity phase three stages process by evolution model. Finally, rate heat generation used as experimental characterization confirmed experiments involving...

In numerical simulations, achieving high accuracy without significantly increasing computational cost is often a challenge. To address this issue, paper proposes an improved finite volume Weighted Essentially Non-Oscillatory (WENO) scheme for structured grids. By employing single-point quadrature rule to perform flux integration on the control faces, designed use in NUAA-Turbo three-dimensional fluid solvers based grids, utilizing RANS and RANS/LES coupling simulate turbomachinery flows....