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In this paper, the output performance of an aerospace pyrotechnic device by simulation is studied. First, the change curve of pressure vs. time of single igniter and double ignition is respectively simulated by SIMULINK simulation software. The result shows that the maximum pressure of the single igniter is 16MPa when the time reaches to 2.5ms. While, with the double ignition, the maximum pressure...
The Elbow-inlet passage with low loss and little width is a typical passage of pumping station. A new optimization criterion for hydraulic design is put forward. The incompressible N- S equations are solved by the finite volume method. Base on the RNG k-ɛ model with Wall-Function Law, the SIMPLEC algorithm is applied for the solution of the discretization governing equation. Using CFD, the flow pattern...
Research on three-dimensional flow field in a postpositive tubular pumping system using numerical simulation based on the Reynolds time-averaged Navier-Stokes equations and the RNG k-ε turbulent model. By using this method, the performances of pumping system such as head, shaft power and efficiency are predicted based on the calculation of different operating conditions. The simulations were carried...
This paper investigates the total dose effects of substrate PNP transistors through experiments. By considering of oxide trapped positive charges and interface traps, the radiation induced excess base current in the irradiated SPNP is simulated. The simulation results showed similar trends with the experimental results, thus the mechanisms of total dose effects in the SPNP transistors are verified.
A modified two-dimensional Eulerian air quality model was used to simulate both the gaseous and particulate pollutant concentrations during October 21-24, 2004 in the Pearl River Delta (PRD) region, China. The most significant improvement to the model is the added capability to predict the secondary organic aerosols (SOA) concentrations because of the inclusion of the SOA formation chemistry. The...
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