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Heat Transfer Study on Liner Wall of Heat Recirculating Combustor

  • Jitendra B. ChaudhariEmail author
  • S. A. Channiwala
Brief Communication
  • 34 Downloads

Abstract

In gas turbine combustors, the internal walls of the liner are always subjected to intense radiation heat, always damaging the combustor liner, resulting in cracking and premature failures of the components. For small diameter combustion, as surface-area-to-volume ratio increases, controlling of wall temperatures again becomes more challenging. The present work employs the concept of liquid film evaporation combustor for small-scale combustion chamber. It uses the wall heat loss for evaporation of liquid fuel, which is very effective way of controlling the high wall temperatures. It acts as cushion to the effect of the radiation heating and recirculates the same heat into the chamber as fuel vapor which otherwise leaves the chamber by cooling air. The previous experiments on such combustor show unstable combustion, highly attributed due to evaporation characteristics of fuel. Understanding of wall heat transfer is therefore very important for successful operation of such combustor. The effect of convective heat transfer coefficient and thermal conductivity on the combustor wall temperatures and the amount of heat that is transferred through the combined effect of radiation, convection and conduction at the surface is investigated in present work. The study is carried out considering both the cases, i.e., without liquid film and with liquid film on outer surface of combustor wall. A computer program in MATLAB using important parameters as input is used to handle the heat transfer computations. The study reveals that the thermal conductivity affects the outer wall temperature, whereas the convective heat transfer coefficient affects both outer and inner wall temperatures. Combustor with liquid film handles higher values of heat flux with relatively lower wall temperatures as compared with the combustor without liquid film.

Keywords

Wall heat transfer Heat recirculation Convective heat transfer Combustion chamber 

List of Symbols

L

Length of cylinder

D

Diameter of cylinder

\(\varGamma_{\text{L}}\)

Initial mass flow per unit width

\(\varGamma_{0}\)

Outlet mass flow per unit width

\(k_{\text{l}}\)

Thermal conductivity

\(h_{\text{lv}}\)

Latent heat of vaporization

\(\rho_{\text{l}}\)

Density of liquid

\(\rho_{\text{v}}\)

Density of vapor

\(\mu_{\text{l}}\)

Viscosity

\(\bar{h}\)

Average heat transfer coefficient

\(Re\)

Reynolds number

\(\dot{m}_{\text{evp}}\)

Rate of evaporation

\(\dot{m}_{\text{f}}\)

Mass flow rate of fuel

\(\delta_{\text{L}}\)

Film thickness

Twan

Initial guess value of outer wall temperature

\(T_{\text{s}}\)

Saturation temperature

Two

Outer wall temperature

Tg

Gas temperature

\(T_{\text{w}}\)

Wall temperature

Tsurr

Surrounding temperature

Twi

Inner wall temperature

Twig

Inner wall temperature based on gas temperature

ri

Radius to inner wall surface from center of cylinder

ro

Radius to outer wall surface

Ai

Convective and radiative heat transfer external surface area

Ao

Convective and radiative heat transfer internal surface area

Rrado

Radiative heat resistances for outer wall

Rradi

Radiative heat resistances for inner wall

Rconvo

Convective thermal resistances for outer wall

Rconvi

Convective thermal resistances for inner wall

Rth

Conductive thermal resistances in material

Rtotal

Total thermal resistance of the system

ho

Convective heat transfer coefficient for external wall surface

hi

Convective heat transfer coefficient for internal wall surface

\(k_{\text{w}}\)

Wall thermal conductivity

em

Emissivity

ap

Stefan–Boltzmann constant

Notes

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.S.V. National Institute of TechnologySuratIndia

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