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Hanna Autio and Erling Nilsson
It is vital to consider acoustic scattering when using geometrical acoustic simulation techniques, such as ray tracing. However, there are few methods for modelling scattering, and most rely on strong assumptions of uniformity on the distribution of scat...
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Hassan Azad, Julie Meyer, Gary Siebein and Tapio Lokki
This paper presents an investigation of the effects of relatively large-scale pyramidal and convex-shaped diffusers on the acoustical properties of a small non-diffuse rectangular room. Room impulse responses (RIRs) were measured in various room configur...
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Zhiping Li, Yujiang Lu, Tianyu Pan and Yafei Zhang
The flow separation occurring in the S-shaped diffuser with boundary layer ingestion (BLI) has a significant effect on the performance of the embedded engine. Previous studies have found that the area ratio (AR) as well as the length-to-offset ratio (LOR...
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Yunfeng Wu, Qingkuo Li, Hang Yuan, Ziliang Li, Shiji Zhou, Ge Han and Xingen Lu
High-pressure ratio centrifugal compressors? diffusers face challenges from high-velocity, non-uniform flow at the impeller outlet, decreasing efficiency and stall margin. To address this, this paper presents a novel vaned diffuser passage design method ...
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Melody R. Mukandi, Moses Basitere, Seteno K. O. Ntwampe, Mahomet Njoya, Boredi S. Chidi, Cynthia Dlangamandla and Ncumisa Mpongwana
The poultry industry generates significant volumes of slaughterhouse wastewater, laden with numerous pollutants, thus requiring pretreatment prior to discharge. However, new technologies must be used to re-engineer the existing wastewater treatment equip...
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Nicolas Poujol, Martin Buisson, Pierre Duquesne and Isabelle Trébinjac
In centrifugal compressors, Mild Surge (MS) leads to unstable operation. Previous experimental work on a centrifugal compressor designed and built by Safran Helicopter Engines (SafranHE) showed that MS corresponds to the pulsation of an alternate stall p...
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Jian Wang, Zhuoyang Song, Rui Chen, Ting Yang and Zuokun Tian
The characteristics of spray droplets are important for calculating the hydraulic performance of sprinklers. In order to evaluate the effects of working pressure and nozzle diameter on the near ground droplet characteristics of the Nelson R33 sprinkler, ...
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Ali Zamiri, Kun Sung Park, Minsuk Choi and Jin Taek Chung
The demands to apply transonic centrifugal compressor have increased in the advanced gas turbine engines. Various techniques are used to increase the aerodynamic performance of the centrifugal compressor. The effects of the inclined leading edges in diff...
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Seung-Chul Lee, Taehyeon Kim and Woo-Sang Park
We propose a novel method for appropriately controlling the luminance distribution of liquid crystal displays (LCDs) for different usage environments by using electric-field-driven liquid crystal (ELC) lenses. The LCD systems are composed of quasi-collim...
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Daniel Hermann, Manfred Wirsum, Douglas Robinson and Philipp Jenny
State-of-the-art centrifugal compressor units utilised in pipeline and in energy storage applications face the challenge of flexible and highly efficient operation. Geometric contouring on the hub side near a vaned diffuser affects the flow in a way whic...
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Victor Moënne-Loccoz, Isabelle Trébinjac, Nicolas Poujol and Pierre Duquesne
The flow in the vaned diffuser of an aeronautical centrifugal compressor designed by Safran Helicopter Engines is analyzed through steady and unsteady pressure measurements at different rotation speeds. The analysis leads to the identification of differe...
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Stefan Höller, Helmut Benigni and Helmut Jaberg
Besides operating a centrifugal pump under normal conditions there are additional operating conditions possible; for example, a pump operated as turbine. Another example would be a pump trip where there are several abnormal operating conditions possible ...
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Roberto Agromayor, Bernhard Müller and Lars O. Nord
Annular diffusers are frequently used in turbomachinery applications to recover the discharge kinetic energy and increase the total-to-static isentropic efficiency. Despite its strong influence on turbomachinery performance, the diffuser is often neglect...
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Roberto Agromayor and Lars O. Nord
Axial turbines are the most common turbine configuration for electric power generation and propulsion systems due to their versatility in terms of power capacity and range of operating conditions. Mean-line models are essential for the preliminary design...
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Stefan Höller, Helmut Benigni and Helmut Jaberg
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Xiaohui Yan, Abdolmajid Mohammadian and Xin Chen
In some outfall systems, wastewaters are discharged into ambient water bodies using rosette-type diffusers in the form of multiple buoyant jets, and it is essential to simulate their mixing characteristics for practical applications and optimal design pu...
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Weiyu Lu, Guoping Huang, Jinchun Wang and Yuxuan Yang
Traveling wave wall is a useful method to suppress flow separation. However, the interaction between the traveling wave wall and unsteady separation flow is complex, which causes difficulty in discovering the corresponding mechanism. To reveal the mechan...
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Roberts Zabels, Kri?s Osmanis, Martin? Narels, Ugis Gertners, Ainars Ozols, Karlis Rutenbergs and Ilmars Osmanis
Augmenting reality (AR) holds many benefits in how people perceive information and use it in their workflow or leisure activities. A cohesive AR experience has many components; nevertheless, the key is display technologies. The current industry standard ...
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Yosua Heru Irawan,Harianto Harianto
Pág. 73 - 82
The study was conducted on GE 1.5 XLE wind turbine blades with a blade length of 4.32 m. This study uses a numerical simulation method with the help of ANSYS Workbench 19 software. Simulation is carried out at wind speeds of 3 m/s, 5 m/s, and 8 m/s. The ...
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Setyo Nugroho, Arrad Ghani Safitra, Teguh Hady Aribowo, Mochammad Arief Julianto
Pág. 62 - 74
Indonesia has potential hydro energy around 70000 MW which has been used around 6% (3529 MW). One of the development constraint is the stream velocity in Indonesian rivers is relative low. It causes bigger turbine dimension needed to achieve power which ...
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