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Joseph Mwangi Ng?aru and Sunho Park
This research investigates cavitation around a marine propeller, employing computational fluid dynamic (CFD) solvers, including an incompressible, isothermal compressible, and fully compressible flow. The investigation commenced with simulations utilizin...
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Ruochen Wang, Guoxin Zhang, Pei Ying and Xiaoping Ma
The Co-Flow Jet (CFJ) technique is an effective way to enhance the aerodynamics of airfoils. The present study is to comprehensively investigate the effects of CFJ key parameters, viz., the jet momentum coefficient, the injection slot location, the injec...
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Raffaella Pellegrino, Miguel Ángel Toledo and Víctor Aragoncillo
The sky-jump spillway is an economical and effective solution to return water to a river, eventually complemented by a pre-excavated basin. However, an inappropriate design could endanger spillways and even the dam itself. For the design of a sky-jump it...
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Mouldi Ben Meftah and Michele Mossa
Turbulence measurement of a dense jet perpendicularly issued into a crossflow is investigated experimentally. The flow-velocity components were extensively measured with a high frequency Acoustic Doppler Velocimeter (ADV) system, whereas, a Micro Scale C...
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Mouldi Ben Meftah and Michele Mossa
Turbulence measurement of a dense jet perpendicularly issued into a crossflow is investigated experimentally. The flow-velocity components were extensively measured with a high frequency Acoustic Doppler Velocimeter (ADV) system, whereas, a Micro Scale C...
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Hanqiao Han, Yun Long and Jinqing Zhong
When we tested the water jet propulsion pump, we found that there were significant vibrations in the pump, especially at small flow points that deviated from the design conditions. The water jet propulsion pump is a mixed-flow pump with guide vane, which...
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Lianjun Chen, Yang Zhang, Pengcheng Li and Gang Pan
This paper aims to reveal the motion law and collision behaviors of shotcrete particle flow jets. A physical model of the jet flow field composed of a nozzle structure and jet area was constructed and meshes with various sizes were used to mesh the nozzl...
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Chi Zhang, Yaguo Lyu, Le Jiang and Zhenxia Liu
The numerical simulation method was used to investigate the deflection and deformation process of a circular lubricating oil jet in transverse shear airflow. The numerical model was compared and validated against the experimental data. The physical param...
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Yuyang Liu and Xian Yi
The tangential jet-induced swirling flow is a highly efficient technology for enhancing heat transfer. This paper explores the application of swirling flow of an airfoil/aero-engine in a hot air anti-icing chamber, aiming to improve the anti-icing perfor...
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Chengze Wang, Huawei Lu, Xiaozhi Kong, Shiqi Wang, Dongzhi Ren and Tianshuo Huang
The high curvature of modern S-ducts causes a strong secondary flow, which seriously affects the uniformity of the compressor inlet flow. In this study, the flow control method of a pulsed jet was applied in the S-duct at an incoming Mach number of 0.4. ...
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Lin Zhang, Junli Yang, Tiecheng Duan, Jie Wang, Xiuyi Li and Kunyuan Zhang
A new idea of nosebleed air jets with strong coupled internal and external flow is put forward using the lateral jet control principle to improve the maneuverability and fast reaction capabilities of hypersonic vehicles. The hypersonic vehicle?s nose sta...
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Xinyi Liu, Zhenbing Luo, Qiang Liu, Pan Cheng and Yan Zhou
Transition delaying is of great importance for the drag and heat flux reduction of hypersonic flight vehicles. The first mode, with low frequency, and the second mode, with high frequency, exist simultaneously during the transition through the hypersonic...
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Bin Qu, Zilong Chen, Dengke He, Fei Zeng, Youfu Song, Yuqing Ouyang and Lei Luo
Today, impingement cooling structures with dimples can effectively ease the burden of turbine blades. This paper investigates the effect of dimple diameter and depth on the heat transfer of the target surface on a laminar-cooled turbine blade with a cros...
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Jaan H. Pu
The failure of swirling ship propellers in marine environments can lead to huge repair costs. One of the main causes of such failure is when propellers tangle with vegetation, especially in shallow flow environments like ports, harbours, or shipyards. In...
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Rongsheng Zhu, Wenhao Shi, Gongchang Gan, Huairui Li, Dawei Yang, Yuchen Duan and Qiang Fu
To investigate the transient characteristics of high-speed axial flow water-jet pumps during start-up and emergency acceleration as well as to analyze how different accelerations affect the performance of internal flow, the k?? turbulence model of the SS...
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Shlomit Valensi and Alon Gany
Open-sea testing of a two-phase marine ramjet vehicle has been conducted. This experimental phase was accomplished following comprehensive theoretical research. The concept of two-phase marine ramjet propulsion consists of a submerged propulsor acquiring...
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Yunkai Zhou, Giorgio Pavesi, Jianping Yuan and Yanxia Fu
A pump-jet, which is generally and widely adopted on underwater vehicles for applications from deep sea exploration to mine clearing, consists of a rotor, stator, and duct, with the properties of high critical speed, high propulsion efficiency, great ant...
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Di Zhang, Hongliang Wang, Jinhua Liu, Chuan Wang, Jie Ge, Yong Zhu, Xinxin Chen and Bo Hu
To study the influence of impinging height H/D on the flow field characteristics of oblique submerged impinging jets, the numerical calculation of an oblique submerged impinging jet was carried out based on Wray?Agarwal (W?A) turbulence model. The jet fl...
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Bo Hu, Hui Wang, Jinhua Liu, Yong Zhu, Chuan Wang, Jie Ge and Yingchong Zhang
The impinging jet is a classical flow model with relatively simple geometric boundary conditions, and it is widely used in marine engineering. In recent years, scholars have conducted more and more fundamental studies on impact jets, but most of the clas...
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Hongbo Shi, Xikun Wang, Qingjiang Xiang, Gonghe Zhang and Lin Xue
In the marine fire suppression system, continuous delivery of dry chemical powder to the fire source with long powder discharge range and high dispersion concentration is essential. The work is devoted to experimental and numerical studies of the flow ch...
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