Heat Transfer Rate Measurements in a Shock-Focused Region in Air

TL;DR

This study experimentally measures heat transfer rates in a shock-focused region in air using a shock tube with a spherical converging section, revealing high heat transfer rates at Mach 2 and Mach 4 shock strengths.

Contribution

It introduces an experimental setup with a spherical shock focusing region and provides heat transfer data at high Mach numbers, which was previously limited.

Findings

Heat transfer rates reached KW/cm2 levels.

Higher heat transfer observed at Mach 4 compared to Mach 2.

Validated the use of in-house K-type thermocouples for high-temperature measurements.

Abstract

An experimental investigation was carried out to study heat transfer rates in a high-temperature, high-pressure region generated using the shock focusing technique. A shock tube test facility with a specially designed spherically converging test section was used in the present study. Two test cases, a shock of initial strength Mach 2 and Mach 4, were investigated. An in-house 10 developed K -type thermocouple was used in the present investigations, and the measured heat transfer rates were of the order of KW/cm2.