Fluid-thermal analysis of aerodynamic heating over spiked blunt body configurations

Integrated thermal protection system based on C/SiC composite corrugated core sandwich plane structure

Coupled investigation on drag reduction and thermal protection mechanism induced by a novel combinational spike and multi-jet strategy in hypersonic flows

A grid strategy for predicting the space plane's hypersonic aerodynamic heating loads

A spiked blunt body flying at hypersonic speed could result in significant thermal interactions between the external flowfield and the internal structure, which have not received enough attention in previous investigations. In the present study, time-dependent, loosely coupled fluid–thermal interaction simulations are conducted on a blunt body equipped with a spike with variable length at a M=5, Re=2×106 flight condition. The results show that, in the range of time considered in the study, a blunt body with a longer spike yields a better dynamic thermal performance, that is, a lower peak temperature on the blunt forebody surface and a slower temperature rise both on the forebody surface and inside the structure can be obtained. In addition, various levels of drag coefficient drop can be observed during the coupling process. A maximum decrease of 5.7% is achieved among the investigated models. The study reveals the necessity of the coupled fluid–thermal analysis to accurately predict the aerothermal enviro...

Fluid–Thermal Interaction Investigation of Spiked Blunt Bodies at Hypersonic Flight Condition

This paper describes the development of a novel, time-adaptive, loosely coupled analysis strategy for efficiently predicting the conjugate heat transfer problems in hypersonic flows. Considering many orders of magnitude disparity of physical characteristic time scales between hypersonic flow behavior and structural heat transfer, a loosely coupled strategy is first developed to efficiently couple an aerodynamic flow computational fluid dynamics solver with a structural heat transfer finite element method solver. Then, an adaptive coupling time stepsize approach based on a control theory point of view is proposed and embedded into this strategy for further efficiency. Finally, the performance of the proposed time-adaptive, loosely coupled analysis strategy is evaluated by performing conjugate heat transfer simulations over a cylindrical leading-edge model. The computational results are presented and analyzed, indicating that this strategy can offer the potential for significant improvements in predicting t...

Time-Adaptive, Loosely Coupled Strategy for Conjugate Heat Transfer Problems in Hypersonic Flows

Time-adaptive loosely coupled analysis on fluid–thermal–structural behaviors of hypersonic wing structures under sustained aeroheating

Coupled heat transfer and thermo-mechanical behavior of hypersonic cylindrical leading edges

This paper deals with a systematic assessment study on the performance of conventional MUSCL slope limiters and recently developed multidimensional limiting processes in the context of aeroheating predictions of hypersonic flows. Three test cases are considered: 1) the flow (M∞=6.47) around a cylindrical leading-edge configuration, 2) the flow (M∞=9.86) around a biconic configuration, and 3) the flow (M∞=10.02) around a double-ellipsoid configuration. Through the careful comparisons between one another and with the available experimental data, numerical results are presented to demonstrate the behaviors of different limiting processes in hypersonic aeroheating predictions. It is found that the medium dissipative van Leer slope limiter could be the best compromise between accuracy and robustness of all the MUSCL slope limiters considered, whereas the multidimensional limiting processes can numerically behave better than all the MUSCL slope limiters, whether in accuracy or in robustness. The results indicat...

Shengtao Zhang

Papers

Time-Adaptive, Loosely Coupled Strategy for Conjugate Heat Transfer Problems in Hypersonic Flows

Time-adaptive loosely coupled analysis on fluid–thermal–structural behaviors of hypersonic wing structures under sustained aeroheating

Coupled heat transfer and thermo-mechanical behavior of hypersonic cylindrical leading edges

Assessment of Limiting Processes of Numerical Schemes on Hypersonic Aeroheating Predictions

Integrated Fluid-Thermal-Structural Analysis for Predicting Aerothermal Environment of Hypersonic Vehicles