Synthetic jets perpendicular to the mainstream have been used to experimentally study the coaxial jets mixing enhancement in this paper. The parameters of coaxial jets such as vorticity, streamwise velocity, radial velocity, Reynolds shear stress, and turbulence intensity are measured using the particle image velocimetry (PIV) and hot wire anemometers. The distribution characteristics of these parameters with and without synthetic jets were obtained. The mechanism of coaxial jets mixing enhancement using synthetic jets was summarized by analyzing these experimental results, and it was also found that the momentum coefficient was the most critical factor for jets mixing enhancement. The comparative experiments fully verified the mechanism, showing that with an appropriate momentum coefficient, the synthetic jets significantly enhanced coaxial jets mixing.
A Solar Dish-Stirling System Model is developed for design, optimization, control, and systems development of Dish-Stirling systems. It models the energy transfer in parabolic concentrator and receiver, cycle thermodynamics, heat flow, mechanical dynamics in Stirling engine and the Starter/Generator. The model's scope extends from the solar energy to thermal, mechanical, and electrical energy out, helping to study complex system interactions among subsystems. It is a non-linear time-domain model, which can be used to simulate transient and dynamic phenomena. And the entire range of system operation can be modeled, from start-up to full power conditions. The model details and simulation results are discussed in this paper.
This paper provides a description of experimental studies of various dynamic distortion properties in a two-dimensional transonic diffuser. Based upon the measured dynamic pressure across the diffuser discharge section, the APRM«^ aplitude power density and probability density function have been analyzed. The results indicate that the dynamic distortion is closely related to the terminal shock wave stability of transonic diffuser, and the distribution of Δί'^^ and PSD are important properties for dynamic distortion. NomenclatureIntroduction b = Channel height This paper provides a description of experimental f = frequency studies of dynamic distortion properties in a two-L = diffuser length dimensional transonic diffuser. Dynamic distortion is Μ = Mach number one of the important subjects of inlet/engine compap = pressure tibility technique. It greatly affects the performance Ρ(Δρ) = probability density function and stability of the propulsion system. Recently t = time several specialists have shown their interest in investiTu = turbulence factor gating dynamic distortion mechanisms, prediction u = flow velocity methods of peak level of dynamic distortion and χ = streamwise coordinate (χ = 0 at difdynamic distortion simulation technology /1-4/. This fuser throat, positive streamwise) paper intends to provide a better understanding of y = vertical coordiante (y = 0 on the the dynamic distortion property and to support diffuser centerline, positive upward) development of flowfield prediction and simulation W = diffuser width for supersonic inlet. AR = area ratio of diffuser Dynamic distortion of inlet diffuser is increased APD = amplitude probability density funcwith the supercritical degree increase, so distortion is tion closely related to the transonic flow of diffuser. Most PSD = power spectral density function importantly, the formation of turbulence type of ΔΡ = fluctuating pressure dynamic distortion is produced by shock wave/ boundary layer interaction, combined with a subsonic, Subscripts adverse pressure gradient behind the terminal shock wave. 1 = inlet station For quantitative determination of dynamic distor-2 = exit station tion in a transonic diffuser, experiments of superc = cut-off filter critical transonic flow in a diffuser have been e = core flow performed. Generally, dynamic distortion has a ranav = average dom property. In the experimental investigation, the RMS = root-mean-square dynamic measuring technique was used. Dynamic
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