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 Wysłany: Nie 2:14, 05 Gru 2010 Temat postu: ugg stivali Test water curtain of fire separation |
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Test water curtain of fire separation
Source of ignition, the fire room (facing the fire side) of the rapid rise in the temperature measuring point, start the water behind the scenes, due to the cooling effect of water curtain, the temperature rose slowly throughout the 15rain end of the experiment, the water curtain to stop, the fire extinguished, the measured point temperature decreased rapidly; no fire throughout the 15rain test space of time, because of water curtain protection, the slow rise in temperature measuring points, and finally maintained at about 20 ~ 30 ℃,[link widoczny dla zalogowanych], non-fire source space (the back surface fire) the upper test point temperature and the water curtain protection compared to decline to around 130 ℃; end of the experiment, although the fire extinguished, but because no cooling water curtain fire insulation protection, high temperature fire space space to non-proliferation of fire , resulting in non-fire source of space rapidly rising temperature measuring point, when the test space ventilation system starts, the temperature was rapidly declining. Some of the figure was no room for fire point temperature measurement is due to start up soon after ignition, when the first test starts the sake of the water curtain. The results show that the water does not start screen (dry), the entire test space, the temperature distribution of smoke showed significant stratification (see Figure 3), that is, the temperature of the same height approximately equal, the upper temperature is higher than middle, middle temperature is higher than the lower, in line 3 zone fire model Zhongchen Hua et al: Experimental water curtain of fire separation. 51. Flue gas temperature stratification in the assumptions, testing and distribution of flue gas flow consistent with its inherent regularity [7; vertically with each point the distance from the fire, the temperature level is also significant (see Figure 4 and 6 .) Start the water curtain, only burning room (facing the fire side) of the distribution of the temperature field still showed significant stratification (see Figure 7 and 11), due to the torsion action with water curtain, non-burning temperature field has no inter- This phenomenon, the temperature on the same cross section is almost equal (see Figure 9 and 13), but also basically the same trend; vertical water curtain with each point increase the cooling effect of heat, temperature change there are some differences from to basically the same (see Figure 1O and 14). System of temperature measurement system error range below 300 ℃, in order to ± 2.5 ℃; over 300 ℃, in order to measure the value of the taxi 0.75. This experiment measured the maximum temperature does not exceed 300 ℃, so the system error of less than ± 2.5 ℃. The test of time and weather differences, test environment temperature difference, the difference in the 3 ~ 5 ℃,[link widoczny dla zalogowanych], we deal with the data has eliminated the test environment temperature. 4 Conclusion (1) test results show that the water curtain can effectively prevent the fire spreading, cooling heat insulation effect is obvious; water curtain fire separation of the main factors is the water curtain water, thickness and intensity of water curtain drops. (2) does not start the water curtain dry, the test space, the temperature distribution of smoke layer in the case showed that the temperature of the same height approximately equal. Temperature is higher than the upper middle, lower middle temperature is higher than that found in a zone fire model assumptions Gas Temperature stratification, gas flow and distribution in accord with its inherent regularity; when the water curtain starts, due to the flexible water curtain action with the back side of the fire is no longer the temperature distribution of stratification. (3) span a large space ship cabin can not set the fire shutter in case of separation,[link widoczny dla zalogowanych], the fire separation by water curtain is feasible, test results show that the experimental design parameters of the water curtain is reasonable and effective large compartment on the ship with water curtain fire separation has an important reference for design. References: [13 concise study. Modern ship fire [M]. Nanning: Guangxi Science and Technology Press, 1995. Wang Zhiguo, E23. Yin Mude. Structure fire in ship fire design [J]. Fire Safety Science, 2001,10 (2) :113-115. [33 Zhongchen Hua, Wang Zhiguo, Yan Mude. Ship fire of [J]. Naval equipment, 2001,[link widoczny dla zalogowanych], ( : 5O a 51. [43 Wang Zhiguo. Zhongchen Hua, Zhu Zhijie, et al. Ship large compartment fire separation technology [A]. 2nd National Conference on Ship and Ocean Engineering Proceedings [C]. Dalian: China Shipbuilding Engineering Society, 2003. [53 Wang Zhiguo, Yang Zhiqing,[link widoczny dla zalogowanych], Feng Ming, et al. Large space ship and fire compartment design fire simulation [J]. Naval University of Engineering, 2003. 15 (4) :42 - 44. [6] China Ship Industry Corporation. Practical Ship Design Manual [M]. Beijing: National Defence Industry Press, 1997. [7] FAN Wei-cheng. Concise Course of fire science [M]. Hefei: China Science and Technology Press, 1995. [83MathewsMK. DelichatisiosMM. Fire spread and development of computer simulation [J]. Fire Safety Science, 1993,3 (3) :18-3O.
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