Experimental study on the acoustic field caused by the interference of supersonic jet with a perforated plate—The optical measurement of sound absorption

2019 ◽  
Vol 146 (4) ◽  
pp. 3000-3000
Author(s):  
Yo Murata ◽  
Kaku Murayama ◽  
Tatsuya Ishii ◽  
Koji Okamoto ◽  
Hirofumi Daiguji ◽  
...  
Keyword(s):  
Experimental Study ◽  
Acoustic Field ◽  
Sound Absorption ◽  
Optical Measurement ◽  
Supersonic Jet ◽  
Perforated Plate

CALCULATION OF THE INTEGRAL NOISE LEVEL AT A FIELD POINT OF A FREE SUPERSONIC JET OF A ROCKET ENGINE

Akustika ◽  
2020 ◽  
Vol 36 (36) ◽  
pp. 22-24
Author(s):  
Anatoly Kochergin ◽  
Valeeva Ksenia
Keyword(s):  
Acoustic Field ◽  
Noise Level ◽  
Rocket Engine ◽  
Supersonic Jet ◽  
Noise Sources ◽  
Field Point

The paper considers an acoustic field created by a supersonic jet (CES) of a rocket engine freely flowing into flooded space. The acoustic field was presented in the form of a diagram of noise isobars, from which it can be seen that the acoustic field is formed by two effective noise sources: the nearest one, lying at a distance of 5-10 calibers from the nozzle cut and the far one, lying at a distance of 15-30 calibers from the nozzle cut.

Numerical Prediction of an Acoustic Field of a Supersonic Jet Impinging on a Plate at Different Inclination Angles

2014 ◽  
Author(s):  
Vladimir Golubev ◽  
Anstasios Lyrintzis ◽  
Reda R. Mankbadi ◽  
Konstantin A. Kurbatskii ◽  
Barrett Guenthoer
Keyword(s):  
Acoustic Field ◽  
Supersonic Jet ◽  
Numerical Prediction ◽  
Inclination Angles

Experimental study of flame propagation across a perforated plate

2018 ◽  
Vol 43 (17) ◽  
pp. 8524-8533 ◽  
Author(s):  
Quan Li ◽  
Xuxu Sun ◽  
Shouxiang Lu ◽  
Zhi Zhang ◽  
Xing Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flame Propagation ◽  
Perforated Plate

Characteristics Experimental Study of Wet Cells HHO Generator with Perforated Plate Electrodes

2016 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
A’rasy Fahruddin
Keyword(s):  
Experimental Study ◽  
Perforated Plate

HHO merupakan gas hasil elektrolisa air yang dapat digunakan sebagai bahan bakar tambahan pada motor bakar. Penelitian ini bertujuan mengetahui karakteristik generator HHO menggunakan elektroda pelat berlubang. Elektroda yang dipakai berupa pelat aluminium dengan ukuran 60 x 60 x 0.5 mm3 dengan variasi tanpa lubang, 4 lubang, 6 lubang, dan 9 lubang. Masing-masing lubang berdiameter 4 mm. Variasi tegangan input 3,5; 6; 7,5; 9 Volt. Karakteristik yang diuji meliputi daya input, debit, dan efisiensi generator HHO. Hasil yang didapatkan dari penelitian ini adalah bahwa debit gas HHO yang terbesar dihasilkan dengan elektroda 9 lubang yaitu sebesar 5,77 cc/min dengan daya input 4,59 Watt. Sedangkan efisiensi generator tertinggi juga dihasilkan dengan elektroda 9 lubang yang mampu mencapai efisiensi 63,16 % dengan daya input 0,52 Watt.

scholarly journals The Methacrylate Adhesive to Double-Lap Shear Joints Made of High-Strength Steel—Experimental Study

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 120 ◽  
Author(s):  
Marta Kałuża ◽  
Jacek Hulimka ◽  
Jan Kubica ◽  
Marcin Tekieli
Keyword(s):  
Experimental Study ◽  
Automotive Industry ◽  
Optical Measurement ◽  
Thin Sheet ◽  
High Strength ◽  
Engineering Structures ◽  
Steel Component ◽  
Anchorage Length ◽  
Lap Shear ◽  
Thin Sheet Metal

In typical technical applications, steel components are usually connected by welding or with mechanical connectors. An alternative solution, typical in the aviation and automotive industry, but not widespread in engineering structures, is to join thin sheet metal using adhesives. The article presents an experimental study of adhesive joints used in overlap connections subjected to static tension. A methacrylate adhesive, selected experimentally from a range of adhesives, which combines the optimum strength and strain properties, was tested. The laboratory tests were carried out on double-lap specimens made of high-strength Domex 700 steel. On the basis of the experimental results, the behavior of the specimens and their failure mechanism, depending on the anchorage lengths used (200, 300 and 400 mm), are described. The tests confirmed the effectiveness of the selected methacrylate adhesive in a practical application. It was shown that with the appropriate anchorage length (adequate to the type of steel components and the joint geometry) between 300 and 400 mm, the capacity of the adhesive joint is higher than the capacity of a single steel component. Two types of specimen behavior were recognized: Quasi-brittle, which occurs at the anchorage length of 200 mm, and ductile, observed for 300 mm and 400 mm anchoring. In addition, thanks to the optical measurement method used, a detailed strain distribution on the specimen surface was determined. The data will be used for subsequent validation of an analytical and numerical model.

Experimental Study of Vortex Shedding From a Solid Sphere in Turbulent Freestream

2005 ◽  
Author(s):  
Himanshu Tyagi ◽  
Rui Liu ◽  
David S.-K. Ting ◽  
Clifton R. Johnston
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Flow Velocity ◽  
Vortex Shedding ◽  
Isotropic Turbulence ◽  
Vortex Formation ◽  
Perforated Plate ◽  
Solid Sphere ◽  
Mean Flow ◽  
Static Pressure Distribution

The study of vortex shedding from a sphere assumes an important role because of its relevance to numerous aerodynamic and hydrodynamic applications. Parameters such as coefficient of drag and static pressure distribution are largely influenced by vortex shedding, and it is found by past studies that the freestream turbulence can interact and alter the vortex formation and shedding drastically. Most of these studies, however, were conducted in the low Reynolds number regime and the vortex shedding results had been described only qualitatively. To better understand the aerodynamics of a sphere in turbulent flow, an experimental study was initiated in a low speed wind tunnel to quantify the vortex shedding characteristics. The Reynolds number of the flow, based on the diameter of the sphere (d), was set at 3.3 × 104, 5 × 104 and 6.6 × 104 by varying the mean flow velocity. The sphere was placed at 20D (= 7.5d) downstream from a perforated plate, where D = 37.5 mm is the size of the holes in the perforated plate, uniquely designed for generating near-isotropic turbulence. Hot-wire measurements were taken at 10D (= 3.75d), 20D (= 7.5d) and 30D (= 11.25d) downstream of the sphere in absence and presence of the perforated plate. The vortex shedding frequency was deduced from the instantaneous flow velocity data.

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