Aiming at the key scientific problems of strengthening cooling and heat dissipation turbine blades, a new type corrugated channel structure was proposed in this work. Refined numerical simulation carried out six different channels, physical mechanism flow transfer analyzed detail. The results show that has smaller resistance than ribbed channel. Among effects sinusoidal, triangular, sawtooth2 channels are stronger rib high Reynolds number, these distributed evenly. Within kinds sinusoidal...

Generation of noise caused by the flow around a cylinder and its control are important in various engineering applications. Based on computational fluid dynamics with acoustic analogy vortex theory analysis, this study aims at investigating ability wavy improving aerodynamic performance reducing noise. Noise mechanisms different Reynolds numbers analyzed. The results show that is helpful for reduction average drag coefficient efficient suppressing fluctuation lift coefficient; consequently,...

The flow across the blade tip clearance in turbomachinery is simplified as pressure-driven leakage (TLF) by isolating it from mainstream. Based on schlieren visualization and numerical simulations, several common features of TLF are achieved. Consequently, a diffusion model proposed to evaluate mean shock motions within clearance. It takes into consideration effects relative wall motion superposing fully developed Couette flow. In addition, over-tip waves treated repeated sawtooth wave...

Abstract Subsonic jet nozzles, commonly used in passenger aircrafts, generate significant noise that travels both downstream and upstream due to large-scale or fine-scale turbulence the plume. To reduce noise, a novel wall treatment method, termed wavy inner (WIW), is proposed. With this smooth near exit of nozzle replaced by treated walls carry small patterns. Numerical simulations were conducted investigate effects WIW treatment. Large eddy (LES) predict unsteady flow field far-field...

For the second-order finite volume method, implicit schemes and reconstruction methods are two main algorithms which influence robustness efficiency of numerical simulations compressible turbulent flows. In this paper, a compact least-squares method is proposed to calculate gradients for distribution flow field variables approximation. The compactness new reflected in gradient calculation process. geometries face-neighboring elements no longer utilized, weighted average values at centroid...

In the past few decades, “buzz-saw” noise was mostly measured and predicted along shroud wall. Uniform or nonuniform axial flows were applied to predictions. Besides, strength of widely assumed be identical radius. However, background distinct radial distributions shock are observed in almost all transonic fans. A possible way solve these problems is couple trajectory with evolution wavefront. case state flow field varies slowly, depicted by geometric acoustics. Meanwhile, wavefront can...

A cell-centered spatiotemporal coupled method is developed to solve the compressible Euler equations. The spatial discretization performed using an improved weighted essentially non-oscillation scheme, where Harten–Lax–van Leer–contact approximate Riemann solver used for computing numerical fluxes. two-stage fourth-order scheme adopted carry out time advancement unsteady problems. proposed featured by coupling time-stepping that can be generalized without case-dependent problem solver....

Abstract Subsonic jet nozzles, commonly used in passenger aircrafts, generate significant noise that travels both downstream and upstream due to large-scale or fine-scale turbulences the plume. To reduce noise, a novel wall treatment method, termed wavy inner (WIW), is proposed. With this smooth near exit of nozzle replaced by treated walls carry small patterns. Numerical simulations are conducted investigate effects WIW treatment. Large eddy (LES) were predict unsteady flow field far-field...

In this paper an industrially well suited numerical simulation is performed with the goal of predicting aerodynamically generated noise at discrete frequencies arising from rotor-stator interaction for a ducted fan configuration. A Frequency based Non-Linear Harmonic (NLH) method used to predict pressure perturbations on surface stator vanes, and propagation these signatures in near field. This approach has potential take into account acoustic waves across shear layers as inside boundary...

Bessel-Fubini ValidationA train of sine waves are introduced into the two-dimensional domain, see Fig. (1), wave front profile and spectrum output to compare with solution at critical position which is given by 3 00 0 2 ( 1)