Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Du Qiang is active.

Publication


Featured researches published by Du Qiang.


Science China-technological Sciences | 2012

Design performance evaluation and vortex structure investigation of different S-shaped intermediate turbine ducts

Du Qiang; Wang Pei; Gong JianBo; Zhu Junqiang

The demand of further increasing bypass ratio of aeroengine will lead to low pressure turbines with higher diameter. Therefore, it is necessary to design a duct to guide the hot gas flow which is expelled from the upstream high pressure (HP) turbine stage to the downstream low pressure (LP) turbine stage. Named by its position, this kind of duct is always called intermediate turbine ducts (ITDs). Due to the pursuit of higher thrust ratio of the aeroengine, this kind of ITDs has to beas short as possible which leads to aggressive (high diffusion) S-shaped ITDs’ geometry. In this paper, two different schemes of high diffusion separation-free S-shaped ITDs were studied with the aid of three-dimensional CFD programs. Although these two ITDs have the same area ratios (AR), because of the different duct length, they have totally different area as well as area change rates. With the detailed calculation results, comparisons were made to investigate the underneath physical mechanisms. Additionally, a direct estimation of the ITDs’ loss is given at the end of this paper and some ITDs’ novel design idea is proposed to initiate some further discussions.


Science China-technological Sciences | 2016

Numerical investigation of radial inflow in the impeller rear cavity with and without baffle

Liu Guang; Du Qiang; Liu Jun; Wang Pei; Zhu Junqiang

In typical small engines, the cooling air for high pressure turbine (HPT) in a gas turbine engine is commonly bled off from the main flow at the tip of the centrifugal impeller. The pressurized air flow is drawn radially inwards through the impeller rear cavity. The centripetal air flow creates a strong vortex because of high inlet tangential velocity, which results in significant pressure losses. This not only restricts the mass flow rate, but also reduces the cooling air pressure for down-stream hot components. The present study is devoted to the numerical modeling of flow in an impeller rear cavity. The simulations are carried out with axisymmetric and 3-D sector models for various inlet swirl ratio β0 (0–0.6), turbulent flow parameter λT (0.028–0.280) with and without baffle. The baffle is a thin plate attached to the stationary wall of the cavity, and is proved to be useful in reducing the pressure loss of centripetal flow in the impeller rear cavity in the current paper. Further flow details in impeller rear cavity with and without baffle are displayed using CFD techniques. The CFD results show that for any specified geometry, the outlet pressure coefficient of impeller rear cavity with or without baffle depends only on the inlet swirl ratio and turbulent flow parameter. Meanwhile, the outlet pressure coefficient of the cavity with baffle is indeed smaller than that of cavity without baffle, especially for the cases with high inlet swirl ratio. The suppression of the effect of centrifugal pumping and the mixing beween the main air which is downstream of the baffle and the recirculating flow of the vortex in the stationary cavity, which are caused by the use of baffle, are the underlying reasons that lead to the reduction of outlet pressure loss.


Archive | 2015

Control structure and method used for reducing separation loss of low-pressure turbine blades

Sun Shuang; Lei Zhijun; Lu Xingen; Du Qiang


Archive | 2016

Rib plate eddy flow control structure, rotation disk cavity system and gas turbine

Liu Guang; Du Qiang; Huang Enliang; Wang Pei; Liu Jun


Archive | 2015

Lubricating oil passage system, bearing co-chamber structure and gas turbine engine

Liu Jun; Du Qiang; Yang Xiaojie; Liu Guang; Wang Pei; Zhu Junqiang; Wen Dianzhong


Archive | 2017

Light bearing base structure

Du Qiang; Liu Jun; Xu Qingzong; Hu Jialin; Wang Pei; Liu Guang; Gao Jinhai; Liu Hongrui; Yang Xiaojie


Archive | 2017

Bearing seat structure capable of effectively reducing temperature of bearing cavity

Liu Jun; Du Qiang; Gao Jinhai; Wang Pei; Hu Jialin; Xu Qingzong; Liu Guang; Liu Hongrui; Yang Xiaojie; Ruan Changlong


Archive | 2017

End wall convex rib structure applied to diffusion pipe wall surfaces

Du Qiang; Liu Jun; Liu Hongrui; Xu Qingzong; Liu Guang; Wang Pei; Yang Xiaojie; Gao Jinhai; Hu Jialin; Hu Chunyan; Guo Baoting


Archive | 2017

Adjustable pad structure used in high-temperature side bearing cavity of engine

Du Qiang; Liu Jun; Liu Guang; Yang Xiaojie; Wang Pei; Xu Qingzong; Liu Hongrui


Archive | 2017

Self-locking sealing structure of impeller machinery and engine with same

Liu Jun; Du Qiang; Liu Guang; Wang Pei; Hu Jialin; Gao Jinhai; Liu Hongrui; Xu Qingzong; Yang Xiaojie

Collaboration


Dive into the Du Qiang's collaboration.

Top Co-Authors

Avatar

Wang Pei

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Liu Jun

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Liu Guang

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Zhu Junqiang

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Lu Xingen

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Gong JianBo

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Lei Zhijun

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Sun Shuang

Civil Aviation University of China

View shared research outputs
Top Co-Authors

Avatar

Zhang Bo

Chinese Academy of Sciences

View shared research outputs
Researchain Logo
Decentralizing Knowledge