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Showing 1 to 20 of 339 for “"Mach number."”.
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Numerical Methods for All Mach Number flows for Gas Dynamics
An original numerical method to solve the all-Mach number flow for the Euler equations of gas dynamics on staggered grid is presented in this thesis. The system is discretized to second order in space on staggered grid, in a fashion similar to the Nessyahu-Tadmor central scheme for 1D model and …
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Numerical study of mach number effects in compressible wall-bounded turbulence
… pressure, dilatation, etc) fields. Centreline Mach numbers, Mcl, up to 6.2 have been considered, for which we find that both explicit compressibility terms in the TKE equation such as the pressure-dilatation and dilatational dissipation, and the implicit compressibility such as …
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All Mach Number Schemes for Highly Magnetised MHD flows and Multi-material Modelling
… framework, in this thesis we develop novel all Mach number algorithms in two key areas of research and applications: (i) visco-resistive, magnetically dominated magnetohydrodynamic (MHD) flows and (ii) multi-material flows. First, we present a new conservative semi-implicit scheme for the ideal …
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An experimental investigation of a low Reynolds number, high Mach number centrifugal compressor
… conditions to correctly match the Reynolds number, which is about 20,000. The impeller tip speed of the test facility matched those in the design full-scale device to capture the effects of compressibility. Two compressor geometries were tested, one with and one without diffuser vanes; the …
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Experimental design to determine the effect of temperature and Mach number on entropy noise
… flow parameters of temperature change and nozzle Mach number. The apparatus simulates entropy noise in an aero engine. In the test rig, compressed air enters an anechoic labyrinth, flows through a settling chamber that straightens airflow, and then goes to the entropy wave generator. The entropy …
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Effects of Mach Number and Flow Incidence on Aerodynamic Losses of Steam Turbine Blades
… to a large range of incident angle and exit Mach number. The blades were tested in a 2D transonic windtunnel. The exit Mach number ranged from 0.60 to 1.15 and the incidence was varied from -34o to 35o. Measurements included downstream Pitot probe traverses, upstream total pressure, and …
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Incident shock Mach number effects on Richtmyer-Meshkov mixing with simultaneous density and velocity measurements
… Laboratory to study the effect of incident shock Mach number (M) on the development of the Richtmyer-Meshkov instability after a shock wave impulsively accelerates a varicose-perturbed, heavy-gas curtain (air-SF6-air). Three cases of incident shock strength were experimentally investigated: M = …
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Experimental Investigation of a Flush-Walled, Diamond-Shaped Fuel Injector for High Mach Number Scramjets
… heated to approximately 313 K into a nominal Mach 4.0 crossstream airflow. These conditions are typical of a scramjet engine for a Mach 10 flight, and heated helium was used to safely simulate hydrogen fuel. The injector was tested at two different injectant conditions. First, it was …
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The aeroacoustics response and shear layer dynamics of confined cavities subject to low Mach number turbulent flow
Cavities exposed to low Mach number flow in various engineering applications are often liable for generating flow-excited acoustic oscillations, resulting in large acoustic amplitudes and vibrations. This compromises the safety and reliability of critical equipment due to a phenomenon attributed to …
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Effects of Tip Clearance Gap and Exit Mach Number on Turbine Blade Tip and Near-Tip Heat Transfer
… gap. The effects of tip clearance and exit Mach number on heat transfer distribution were investigated on the tip surface using a transient infrared thermography technique. In addition, thin film gages were used to study similar effects on the near-tip regions at 94% based on engine blade …
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Investigation of exit plan conditions for a 90 ̊bend in circular pipe as a function of inlet mach number
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1958.
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A numerical investigation of the compressible mixing layer
The effect of Mach number on the plane muong layer has been investigated by means of linear stability theory and two- and three-dimensional direct numerical simulations of the compressible Navier-Stokes equations. The objective was to identify the effects of compressibility on a building-block …
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Assessment of an Innovative Experimental Facility for Testing Diffusing Serpentine Inlets with Large Amounts of Boundary Layer Ingestion
… the aft sections of these aircraft. It generated Mach numbers ranging from 0.19 to 0.4 and boundary layer thicknesses between 36% and 45%. The circumferential distortions at the aerodynamic interface plane of the serpentine inlet were also calculated, and ranged between 0.0042 for the lowest Mach …
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Numerical Analysis of the Viscous Flow in a Supersonic Diffuser
… used to take a uniform supersonic flow at one Mach number to a uniform supersonic flow at a lower Mach number. The theory gives an exact solution for two-dimensional flow. The shape of the diffuser depends on the entrance and exit Mach numbers. For a given inlet Mach number, there is a minimum …
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New mixing-length model for numerical solution of turbulent supersonic flows
… where there exist large changes of density and Mach number. The new mixing-length model which has been found here is a generalization to include gradients of Mach number, pressure and density; and the local parameters values, such as speed of sound, density, Mach number, ratio of specific heats …
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An approximate solution for a cone-cylinder in axially symmetric transonic flow
… be applicable up to a limit value of tree stream Mach number. An investigation is carried out herein to determine both the correct form of the rule and its limits of applicability. As a result of this investigation, it is concluded that the upper limit is the lower free stream critical Mach …
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