hydraulic analogy


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hydraulic analogy

[hī′drȯ·lik ə′nal·ə·jē]
(fluid mechanics)
The analogy between the flow of a shallow liquid and the flow of a compressible gas; various phenomena such as shock waves occur in both systems; the analogy requires neglect of vertical accelerations in the liquid, and restrictions on the ratio of specific heats for the gas.
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The two-dimensional axi-symmetric equivalent combustor model[6-8] for the present investigations was designed, using the hydraulic analogy as suggested by Rao and Seshadri [2-5].
" Theory of Hydraulic analogy for steady and unsteady gas dynamics, modern developments in gas dynamics".
[3] J S Rao, VV R Rao and V seshadri, " Hydraulic analogy for Non-ideal compressible gas flows" proceeding of TFTOMM, international conferences, rotor dynamic problems in power plants, Rome,1982,p267.
[4] J S Rao and V seshadri " Investigation of flow in the combustion chamber of the GTX engine using Hydraulic analogy." Technical report No CW-37/84, Indian institute of Technology, Delhi,1990.
(4) Professor, Women's College, Gulbarga, India Table 1: Analogous quantities of classical hydraulic analogy 2D gas flow Free Surface incompressible water flow Temperature ratio T/T0 Hydraulic depth ratio h/h0 Density ratio Hydraulic depth ratio h/h0 Pressure ratio P/P0 Sq of hydraulic depths ratio (h/h0)2 Sound Velocity a0 Wave Velocity _(gh) Mach number V/ a0 Froude number V/_(gh) Velocity ratio V/Vmax Velocity ratio V/ Vmax Subsonic flow M<1 Streaming Water flow Fr<1 Supersonic flow M>1 Shooting Water Flow Fr>1 Compressible shock Hydraulic jump
The principal approaches for estimating the evacuation time are: (1) an empirical correlation of total evacuation time for building, (2) a hydraulic analogy to simulate people as fluid particles, and (3) a hydraulic analogy to simulate people as fluid particles with consideration of the behavioral aspects of the people.
This paper focuses on estimating evacuation time using a hydraulic analogy to simulate people as fluid particles without consideration of the behavioral aspects of the people.
directive plus 1.50 1:00 Occupants evacuated status EVACUATION ANALYSIS BY HYDRAULIC ANALOGY
Evacuation by hydraulic analogy is based on the following assumptions:
Nelson and MacLennan refer to this small distance as a "boundary layer", in keeping with the hydraulic analogy for people movement.
We were encouraged to understand this phenomenon through visualization of what was known as, hold on to your hats, folks, a "hydraulic analogy," in which voltage equated to water pressure, conduction equated to pipes, current equated to water flow, resistance equated to loss of head in pipes during flow or in overcoming gravity during uphill flows, and power was equated to work done by water in, say, a mill or a turbine.