Effects of Wall Emissivity on Aerodynamic Heating in Scramjets

Ju, Pengfei

doi:10.32604/fdmp.2020.09666

Cited by 2 publications

(1 citation statement)

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“…More specifically, a significant amount of the initial kinetic energy possessed by the spacecraft is directly converted in internal energy with a remarkable ensuing increase in the temperature of the gas surrounding the vehicle (thermal load). The formation of shock waves also contributes to this process resulting in a significant increase of the gas temperature before it reaches the surface of the vehicle (see, e.g., Zhou et al [3]).…”

Section: Introductionmentioning

confidence: 99%

A Mixed Radiative-Convective Technique for the Calibration of Heat Flux Sensors in Hypersonic Flow

Espósito¹,

Lappa²,

Pagliara³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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The ability to measure the very high heat fluxes that typically occur during the hypersonic re-entry phase of space vehicles is generally considered a subject of great importance in the aerospace field. Most of the sensors used for these measurements need to be checked periodically and re-calibrated accordingly. Another bottleneck relates to the need to procure thermal sources that are able to generate reliable reference heat fluxes in the range between 100 and 1000 kW/m 2 (as order of magnitude). In the present study, a method is presented by which, starting from a calibration system with a capacity of approximately 500 kW/m 2 only, heat fluxes in the range of interest for hypersonic applications are generated. The related procedure takes advantage of established standards for the characterization of a radiative heat flux. It also builds on the hybrid radiative-convective nature of typical hypersonic heat fluxes and the yet poorly explored possibility to use convective sources of heat to produce high-intensity fluxes. The reliability of such a strategy has been tested using a high enthalpy supersonic flow facility relying on an electric arc-heater and pure Nitrogen as work gas. Stagnation-point heat fluxes have been successfully measured (with reasonable accuracy) in the range between 600 and 1500 kW/m 2 for values of the centerline enthalpy spanning the interval from to 6 to 24 MJ/kg.

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Section: Introductionmentioning

confidence: 99%