Work

Unsteady conjugate heat transfer effects on flow characteristics in transonic flow

Year: 2025

Type: article

Abstract: We present a detailed study into compressible flows in presence of unsteady conjugate heat transfer to the walls. The investigation reveals that all flow quantities experience drift until thermal steady-state is achieved in both fluid and solid domains. The drift follows a characteristic exponential decay and we demonstrate that the heat transfer process between the two domains is ruled by the ratio of thermal capacity and the Stanton number that characterises the interface. To illustrate these effects, we numerically analyse the influence of slow thermal transients due to conjugate heat transfer on discharge characteristics of non-adiabatic nozzles.A transonic nozzle with thermally conducting walls is simulated using numerical methods with different fidelity and the transientevolution of mass flow rate is monitored. Additionally, it is observed that while preheating does not affect the decaying timeconstant of the drift, the bounds of the decay are directly proportional to the initial temperature difference

Source: International Journal of Heat and Mass Transfer

DOI: 10.1016/j.ijheatmasstransfer.2025.127036

Authors: Yann Dreze, Luca di Mare

Institution: University of Oxford

Language: English

Topic: Computational Fluid Dynamics and Aerodynamics

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,220

Funders: Rolls-Royce, University of Edinburgh, Engineering and Physical Sciences Research Council