Research on the drag reduction performance induced by the counterflowing jet for waverider with variable blunt radii

Abstract

Waverider will endure the huge aero-heating in the hypersonic flow, thus, it need be blunt for the leading edge. However, the aerodynamic performance will decrease for the blunt waverider because of the drag hoik. How to improve the aerodynamic performance and reduce the drag and aero-heating is very important. The variable blunt radii method will improve the aerodynamic performance, however, the huge aero-heating and bow shock wave at the head is still serious. In the current study, opposing jet is used in the waverider with variable blunt radii to improve its performance. The three-dimensional coupled implicit Reynolds-averaged Navier-Stokes(RANS) equation and the two equation SST k-ω turbulence model have been utilized to obtain the flow field properties. The numerical method has been validated against the available experimental data in the open literature. The obtained results show that the L/D will drop 7~8% when R changes from 2 to 8. The lift coefficient will increase, and the drag coefficient almost keeps the same when the variable blunt radii method is adopted, and the L/D will increase. The variable blunt radii method is very useful to improve the whole characteristics of blunt waverider and the L/D can improve 3%. The combination of the variable blunt radii method and opposing jet is a novel way to improve the whole performance of blunt waverider, and L/D can improve 4~5%. The aperture as a novel way of opposing jet is suitable for blunt waverider and also useful to improve the aerodynamic and aerothermodynamic characteristics of waverider in the hypersonic flow. There is * Associate Professor, Corresponding author, E-mail address: gladrain2001@163.com, Phone: +86 731 84576447 -2 -the optimal P 0in /P 0 that can make the detached shock wave reattach the lower surface again so that the blunt waverider can get the better aerodynamic performance.

Drag reduction investigation for hypersonic lifting-body vehicles with aerospike and long penetration mode counterflowing jet

“…The vehicle nose is subjected to severe aerodynamic heating and strong shock wave drag during high speed flight, contributing disproportionately to the vehicle drag and aerothermal loads, which translate into poor aerodynamic performance and stringent thermal protection system requirements, and other performance penalties including vehicle range, weight and payload. Thus, a variety of techniques have been implemented, and these techniques include aerospike [1][2] [3], counterflowing jet [4][5] [6] and energy deposition [7]. But the power budget and the system complexity are highly prohibitive for using the energy deposition concept.…”

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

“…However, since no change in the shock system can be attained, the cause of aeroheating is not handled and no drag reduction can be expected from such devices. Similar devices were examined by the group of Huang as jet aperture and multiple orifices at the leading edges of a waverider [200,201] and hypersonic vehicle [202] configurations. Multiple orifices over-performed the single aperture while especially with odd number of orifices since an orifice was placed at the A pposing jet device with platelet transpiration passive cooling device was explored numerically by Yisheng et al [203] and then by Shen et al [204], [205] for different freestream and operating conditions.…”

“…In terms of vehicle configurations, the majority of studies examined the O a small percentage of studies focused on the impact of opposing jet on real shapes of supersonic and hypersonic vehicles. The real configurations that were examined included space capsules [158,194,206,237], high speed aircraft [143,155], and waverider [200,201].…”

Free Form Deformation Method Applied to Modeling and Design of Hypersonic Glide Vehicles

“…Hypersonic glide vehicles (HGVs) have become a research topic owing to their high speed, high maneuverability, and high-altitude flight. Unlike traditional aircraft, the body of a HGV provides the main lift force and its aerodynamic shape is characterized by a large windward side [1], aerodisk design [2], thermal protection shield [3], and blunt leading edge [4]. The typical HGV shapes include lifting body [5], blended wing body [6], and waverider body [4], [7].…”

“…Unlike traditional aircraft, the body of a HGV provides the main lift force and its aerodynamic shape is characterized by a large windward side [1], aerodisk design [2], thermal protection shield [3], and blunt leading edge [4]. The typical HGV shapes include lifting body [5], blended wing body [6], and waverider body [4], [7]. During the aerodynamic shape design of HGVs, parametric modeling plays a crucial role [8] in determining the performance of the HGV, such as the lift-to-drag ratio (L/D), processing difficulty, ballistic trajectory, stability, and maneuverability.…”