Papers by Keyword: Detonation

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Authors: Yan Hua Guo, Dong Xian Zhuo, Li Xin Wu, Lin Ma, Zi Xiang Weng, Rui Wang
Abstract: A facile, efficient, and low energy consumption detonation method to prepare few-layered graphene nanosheets has been developed using graphite oxide as a precursor at detonation induced temperature as low as 100 °C . The composition and structure of as-produced few-layered graphenes were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR), Specific Surface (BET), Transmission Electron Microscopy (TEM), Raman Microscope, and Atomic Force Microscope (AFM). Results showed that the as-produced graphenes were transparent and few-layered with a high specific surface area (225.9 m2/g). The investigation opens a new road to prepare few-layered graphene nanosheets at low exfoliation temperature in a low-cost and facile way.
260
Authors: Kazuhito Fujiwara, Tetsuyuki Hiroe, Yasuhide Ohno, Kazuyuki Hokamoto, Tatsuya Nakao
237
Authors: Yu Kun Chen, Ke Yin Wang, Hai Ying Huang, Pai Hang Zhao
Abstract: This paper analyzed the formula for calculating the velocity and scatter radius of water mist droplets after detonation. Through establishing model, calculating by the formula and simulation of theoretical model, the reasons of deviation between calculation and simulation results were found out. In order to make theoretical calculation more accurate and applicable, new formula was created by introducing correction factors.
3434
Authors: Piotr Wolański
Abstract: In this paper experimental research on rotating detonation carried out at the Institute of Aviation (IA) in Warsaw are presented. Research was focused on 3-D numerical simulations of detonation propagation in cylindrical chambers and on evaluation of conditions at which rotating detonation is propagating in cylindrical channels for kerosene-hydrogen-air mixtures. Conducted simulations are used for analysis of complex flow – detonation front interaction and for estimating the thermodynamic parameters of the outflow gases. Extensive research on continuously propagating rotating detonation in many different chambers and in different fuel-air mixtures were tested. On bases of conducted calculations, as well as results of experimental study, a few chamber were selected for tests with GTD-350 engine. It was shown that application of the continuously rotating detonation to GTD-350 engine can results with increased efficiency of the engine.
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Authors: Pinku Debnath, Krishna Murari Pandey
Abstract: Detonation combustion wave is much more energetic combustion process in pulse detonation engine combustion system. Numerous experimental, theoretical and numerical analyses have been studied in pulse detonation engine to implement in practical propulsion system. In this present computational study the simulation was carried out for deflagration flame acceleration and deflagration to detonation transition of hydrogen air combustible mixture inside the detonation tube with and without Shchelkin spiral. A three dimensional computational analysis has been done by finite volume discretization method using ANSYS Fluent 14 CFD commercial software. The LES turbulence model with second order upwind discretization scheme was adopted with standard boundary conditions for unsteady combustion wave simulations. From the computational study it was found that intensity of detonation wave velocity and dynamic pressure is higher near to the boundary of Shchelkin spiral in detonation tube. The contour plots comparisons clearly show that deflagration flame accelerates in detonation tube as present of Shchelkin spiral. The contour plots also suggest that deflagration flame velocity and pressure are less in without Shchelkin spiral in detonation tube. The accelerating detonation waves are approximately near about Chapment-Jouguet values in detonation tube with Shchelkin spiral.
136
Authors: M.G. Kovaleva, Yu.N. Tyurin, N.J. Vasilik, O.V. Kolisnichenko, M.S. Prozorova, M.Yu. Arseenko, V.V. Sirota, I.A. Pavlenko
Abstract: In this study, a multi-chamber detonation sprayer (MCDS) was applied for deposition of Co-Cr-Al-Y powder coatings (200-250 mm thick) on nickel base superalloy JS6U (Russia). Powder Co-25Cr-11Al-1Y (d(0.1): 6.6 μm, d(0.5): 62.7 μm, d(0.9): 123,4 μm) was used to deposit of a coatings. The coatings microstructures and phase compositions were characterized using SEM, OM and XRD techniques. Measurement of the microhardness of samples was done with a micro-hardness tester DM – 8B using a Vickers’s indenter with load on of 0.1 N. It was established that MCDS has provided the conditions for formation of a dense layer with porosity 0.05% and microhardness 600±50 HV0.1.
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Authors: A.T. Nurmukhametov, A.G. Popov, D.A. Demoretsky
Abstract: A new design of shaped charges with a complex cumulative casing was proposed. The casing consists of two parts: conical and spherical. Mathematical modeling is conducted to determine the optimum shape of the cumulative casing. The feasibility of increasing the inlet area formed at detonation of the proposed shaped charge up to 2.8 times has been demonstrated.
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Authors: Wing Cheng, Shigeru Itoh, Scott Langlie
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Authors: Yukio Kato, Yuichi Nakamura, Kenji Murata, Kouhei Inoue, Shigeru Itoh
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Showing 1 to 10 of 36 Paper Titles