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 Wysłany: Sob 20:40, 04 Gru 2010 Temat postu: ugg boots günstig Nozzle temperature and stress v |
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Nozzle temperature and Numerical Study of Stress
Thermal stress is also the largest species. To limonene was thirty-three thousand three hundred thirty-three three Lan Lan to 8 Xiongyong Liang, et al: nozzle temperature and stress field values of 2) First row node through three different materials interface, the equivalent stress curves of three step (see Figure 6 (a)), while the Second column materials only through a different interface, the curve is only one step (see Figure 6 (b)). Can be seen at the interface of different materials will now be obvious stress change phenomenon,[link widoczny dla zalogowanych], which can show different material parameters, especially the expansion coefficient of the different structures in different materials so that at the interface of severe stress concentration, which is in the nozzle design should pay attention. With the stress contour can be given the location of maximum equivalent stress at the end of the 1S and the expansion of insulation material at the interface aluminum casing segment, as shown in Figure 7 (b) below. In the temperature gradient (Figure 7 (c)) where the temperature gradient in the largest area, so by the rapid temperature change and thermal expansion coefficients of the stress of creating a greater gap. r / cm (a) First column node equivalent stress curve r / cm (b) Second column node equivalent stress curves of Figure 6 two nodes and other effects on the force curve Fig. 6EquivalentstresscurvesofthetWOarrangements00456tl 』Ⅳ t0136OA810.2260272 {1317 (a) 1S the end of the equivalent stress contour (b) lS location of the end of the maximum equivalent stress stress distribution (C) 1S maximum equivalent stress of the end of the temperature gradient map the location of the end of the equivalent stress 71S cloud and the temperature gradient cloud Fig. 7Equivalentstressandtemperaturegradientcontourattheendoflsecond4 Conclusion nozzle ablation and thermal protection issue has been a nozzle design must be considered an important part of the temperature field from the text results can clearly see the importance of protective layer. Nozzle temperature gradient on the formation of large material damage to the thermal stress, thermal stress generated due to uneven temperature, but the combination of a variety of materials for the nozzle, the maximum stress is not necessarily appear in temperature gradient is greatest, we must consider the different properties of materials and integrated form of the difference. Thus the analysis of thermal stress of different materials should be special attention to the larger thermal stress caused. In order to accurately calculate the size of thermal stress, consider the properties of temperature is necessary. In addition, compared to a given empirical formula calculated by the parameters and boundary conditions given by the results of CFD method for fluid-solid coupling parameter method is more general in accuracy and has its advantages. References: [1] Sun Jufang, Sun Bing, phase-liter sea. Composite structure of solid rocket motor nozzle temperature field and stress field calculation [J]. Propulsion Technology, 1994,15 (1): 23 ~ 31. SUNJufang, SUNBing, XIANGShenghai. Theoreticalcalculationofcomplexnozzle'Stemperatureprofileandstressprofileinsolidrocketmotor [J]. JournalofPropul ~ sionTechnology, 1994,[link widoczny dla zalogowanych],15 (1) :23-31. [2] Wang Wei,[link widoczny dla zalogowanych], Wang liters. Nozzle expansion section of insulation ablation calculations [J]. Rocket technology with the body, 1999,22 (3) :16-19. WANGWei. WANGDesheng. Ablationcalculationofnozzledivergenceconeinsulation [J]. JournalofSolidRocketTechnology,[link widoczny dla zalogowanych], l999, 22 (3): l6-19. [3] Bing Sun, Sun Jufang. Finite element method with moving boundary of the nozzle temperature [J]. Juveniles into the technology,[link widoczny dla zalogowanych], l995, 16 (5) :54-58. SUNBing, SUNJufang. Acalculationaboutatemperaturefieldofboundarymovementnozzlewithfiniteelementmethod [J]. JournalofPropulsionTechnology,】 995,16 (5): 54 ~ 58.
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