 |
Aerospace Engineering
University of Bristol
Queens Building
University Walk
Bristol BS8 1TR, U.K.
|
|
Thermo-fluid
Dynamics Research
(Multiphase
Flow, Heat & Mass Transfer,
Gas
Turbine, Topics with Representative Papers)
 |
MULTIPHASE FLOW (CFD and Analysis) |
|
The department has a strong base for research in multiphase flows. Previous
successful projects covered diverse topics of engineering as well as
of fundamental importance. The outcome of these projects
has appeared in seminal Journals and major conferences.
The primary
activities concern modelling the flow of multiphase mixtures - either solid-particle-laden-gases
or vapour-droplet mixtures, e.g. moist air, - through a combination
of numerical calculations (Computational Fluid Dynamics) and theoretical
analysis. This is an interdisciplinary research area requiring synthesis
of ideas from several fields such as fluid mechanics, thermodynamics, and,
heat and mass transfer.
Examples
of previous successful projects include :
-
Formulation of a unified theory and
an extremely efficient calculation method of particle deposition in a turbulent
flow field
-
Application of CFD for predicting oscillating
and moving shock waves in two-phase mixtures
-
Development of CFD codes for predicting
the flow of wet steam
-
Fundamental studies of relaxation gas
dynamics and structure of shock waves in vapour-droplet flow
-
Development of a theory and tools for
interpreting total pressure and total temperature in multiphase flow
-
Development of a new theory (based on
Monte-Carlo simulation) of nucleation of water droplets in large, multistage
steam turbines responsible for 80% of world-wide electricity generation.
The research interest in multiphase
flows is also shared by other departments in the faculty. |
Topics
of continuing interest
|
HEAT
and MASS TRANSFER
Topics of
Current Interest :
 Analysis
of mass, momentum and energy transfers between particles or droplets and
the surrounding vapour (or gas)
Design
and analysis of novel heat exchangers with radically improved energy transfer
rate
Analysis
of the cooling of turbine blades in aero gas turbines. (This work is being
conducted in collaboration with Rolls-Royce.)
GAS
TURBINE PERFORMANCE AND OPTIMISATION
|
A systematic methodology for the thermodynamic optimisation of civil bypass
engines (turbofan or advanced propulsors) has been developed.
Work
in progress: Analysis of the cooling of turbine blades in aero gas turbines.
(This work is being conducted in collaboration with Rolls-Royce.) |
|
| TOPICS
WITH REPRESENTATIVE PUBLICATIONS |
|
(Click on the appropriate publications for details)
|
Topics
|
Representative
Publications
|
 |
Turbulent
Transport of Particles |
A unified
Eulerian theory of turbulent deposition to smooth and rough surfaces,
J. Aerosol Science,
vol. 28, no. 8, 1997, p. 1517-1537. |
|
Optimisation
and Performance of Gas Turbine Engines |
Optimisation
of aero gas turbine engines,
Aeronautical Journal,
vol. 105, no. 1049, July 2001, p. 345-358.
Performance
and optimisation of gas turbines with real gas effects,
IMechE Proc., Part A, J.
Power and Energy, vol 215, no A4, 2001, p. 507-512.
An efficient
generic method for calculating the properties of combustion products,
IMechE Proc., Part A, J.
Power and Energy, vol. 215, no. A3, 2001, p. 375-387.
Optimum fan pressure ratio for bypass
engines with separate or mixed exhaust streams,
AIAA J Propulsion and Power,
vol 17, no. 5, Sept-Oct 2001, p.1117-1122. |
|
CFD of
Two-phase Flow |
Two-Phase
Flows with Phase Transition, In
VKI Lecture Series 1995-06,
von Karman Institute for Fluid Dynamics, Belgium, 1995, p 1-110.
Time-marching
prediction of unsteady condensation phenomena due to supercritical heat
addition,
Proc. conf. on Turbomachinery
: Latest Developments in a Changing Scene, London, IMechE,
1991, p. 167-177. |
|
CFD of
Moving Shock Waves |
Stationary
and moving normal shock waves in wet steam, In
Adiabatic Waves in Liquid-Vapour
Systems, (ed. G.E.A. Meier and P.A. Thompson), Springer Verlag,
1990, p 159-170. |
|
Novel Theory
of Nucleation (with CFD) |
The effect
of flow unsteadiness on the homogeneous nucleation of water droplets in
steam turbines,
Philosophical Transactions
A of The Royal Society, vol. 349, 1994, p. 445-472. |
|
Relaxation
Processes & Structure of Shock Waves |
A unified
theory of aerodynamic and condensation shock waves in vapour-droplet flows
with or without a carrier gas,
Physics of Fluids,
vol 6, no 5, 1994, p 1893-1913.
Normal shock
wave structure in two-phase vapour-droplet flows,
Journal of Fluid Mechanics,
vol. 228, 1991, p 243-274.
The
physics of relaxation processes and of stationary and non-stationary shock
waves in vapour-droplet flows, In
Transport Phenomena in Heat
and Mass Transfer (ed. J.A. Reizes), Elsevier, 1992, p 1404-1417.
Structure
of partly dispersed normal shock waves in vapour-droplet flows,
Physics of Fluids A,
vol 4, no 7, 1992, p 1566-1578. |
|
Rankine
Hugoniot Relations |
Jump conditions
across normal shock waves in pure vapour-droplet flows,
Journal of Fluid
Mechanics, vol 241,1992, p 349-369.
A unified
theory of aerodynamic and condensation shock waves in vapour-droplet flows
with or without a carrier gas,
Physics of Fluids,
vol 6, no 5, 1994, p 1893-1913. |
|
Total Pressure
and Temperature in Two-phase Flows |
A unified
theory for the interpretation of total pressure and temperature in two-phase
flows at subsonic and supersonic speeds,
Proceedings of the Royal Society,
vol. 454, 1998, p. 671-695. |
|
Thermal
Choking |
Thermal choking
due to non-equilibrium condensation,
ASME Journal of Fluids Engineering,
vol. 116, 1994, p 599-604. |
|
Novel Heat
Exchangers |
Overview
of the Development of Heat Exchangers for Use in Air-Breathing Propulsion
Pre-Coolers,
Acta Astronautica,
vol. 41, no. 11, 1997, p. 723-729 |
|
Solar Energy |
The effect
of bottom reflectivity on the performance of a solar pond,
Solar Energy, vol.
39, no. 4, 1987, p 361-367.
Concentration
profile in the gradient zone of small solar ponds,
Solar Energy, vol.
38, no. 2, 1987, p 135-136. |
This Page is maintained by A.
Guha . |