moncler jas Mine fire during the network solver _

[v7312937]

Mine fire period wind network solver


Wind during the network solver. The operation of the system shown in Figure 1. 2 temperature calculation model when a fire occurs somewhere in the roadway. Plume discharge process, Chen-po {circle The theoretical derivation, obtained by negative plume temperature is reduced exponentially. The mathematical model: a △ e, a r (1) where a '- from the fire source (m) at the plume temperature, K: - the distance from the fire source, m; away from the fire source z (m) at the plume temperature value, K; L a tunnel perimeter, m1 ~ air constant pressure specific heat, J / kg, K: cigarette-flow velocity, ra / s; r plume roadway cross-section, mf - Smoke bulk density. Usually taken to 1.01kg / m. ; - Angry that section of roadway before the air temperature, KI - convective heat transfer coefficient (transfer coefficient), when the smoke stream flows through the tunnel, its absolute temperature 1K, the second in the lra absorbed by the walls of the Lane heat (J / m · K), d values ​​obtained according to the following empirical formula: port = 2 +4 r 4 conditions in the mine to take 5 to 10. D ore,ugg boots, ore], 1-l 1996 49 Jiangsu Coal period of Sri Lanka in real applications,moncler jassen, due to formula (1) determine the parameters required more labor, especially in some parameters (such as A7h,,) range more difficult to accurately value the fire, resulting in the calculation of a pier in the experiment are not allowed even to draw the parameters, the calculation result is equal to the value of the real sad, but when applied to other mine or mines in different locations the same time, also because the conditions The changes resulting from the calculation results and the actual difference between the larger, so that the calculation of wind pressure over the fire too error, resulting in a fire during the wind is difficult to meet the actual solver ridicule, not to avoid disaster relief services. T for the small to solve these problems we explored the use of safety monitoring system measured the temperature of the fire calculation pressure, the wind A solver methods. In the roadway at a greater risk of angry romantic setting under the two temperature probes ①, @, a total of two exploration away 'm),ugg uk, shown in Figure 2. l-b - eleven - a --- r a ---- 1---------- _ - a fff === carry = 'ridicule 2 temperature probe installation diagram ① a temperature probe ②】-2 temperature probe; a head and 2 l temperature operation of the distance between the probe temperature will be angry when the roadway temperature probe l of the probe temperature value, respectively, on behalf of all the formula (1), after finishing well have derived : 1 'a stare (iTji - tI + £ (2) Yan-style towel a) temperature probes 1 and 2 the distance between the probe temperature, m: 7 period of one hundred and eleven fire thrust head l asked the measured temperature of smoke Kn a fire, the temperature of phase 2 illustrates voltage-temperature probe measured the temperature of the plume, K} f-~ a fire Growing the location of a temperature probe tunnel airflow temperature, K; tz a fire before the delete location roadway temperature probe 2 Merry temperature K; 3 fire during the air network solver formula (0) when the feast is based on measuring the temperature of fire introduced that eliminates the impact of various factors, T Chuan T, £,, t are real deep values, The more accurate value of tellurium. Therefore, the more accurate the results of the calculation model, the value of not only I'c N. N. 4 -, a value difficult to determine, it is with the combustion of the type, quantity, oxygen supply, burning time and iliac Heat absorbing properties of the solution areas such as rock and change in the combustion process. Its value is always changing. As it changes,moncler jas, also changes air pressure caused the fire, so that the roadway is also changing stroke volume, leading to instability in the mine ventilation system in order to accurately reflect the instability, we propose a change in the amount of the various branches of the wind range drawer to represent the wind during the fire situation of the comb. That period in the fire, fire on the wind A wind pressure air distribution on the impact of the branch is not constant, but by fire, smoke up, have a certain minimum temperature fluctuation we summarize our analysis has been done in a variety of combustion Experiment with different fuels in Table 4 range in the convex L in the practical. Range of maximum and small values ​​were calculated, the points can be derived roundworm stream temperature range drawer and changes in air pressure range of fire, wind generation in order to fill solver solver in the wind-yang t Phoenix can be obtained in the various branches of the amount of range. Varies with the amount of air that fires the romantic period is more realistic state of the fire during the process of turning the wind A solver such as prince Yu 3. Table] John flame burning mine common thermometer tough} crucible burning coal) surgery material belt flame temperature (K) f19ZI1273 ~ 1450l173 ~ 1342 L ~ ~ I started to teach A collection for the fine cast behead J Plant Road surface rain screen] pull twilight Lu Yu dirty 7___ ■ aphid choke butterfly cream cream fan characteristic curve I i Po Zhi Gang Gang 0 catastrophic wind flow solver (the transfer p. 30) hire a kettle
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answer: the bride. because today is the bride, tomorrow is his wife.
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answer: chicken run in the wrong direction
23 East school bell rang, but not one student in the classroom, how is it?
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24 Lingling never learned arithmetic, but praised her math teacher is among the best, why?
answer: count from one to two
25 When one foot onto the New World after Columbus, followed by what?
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26 Some people say that eating fish can avoid the risk of myopia, and why?
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27 what the answer is no tongue
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29 thieves started to run, why?
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30 days of chewing gum little tomorrow, can someone also said that he bad breath, and why?
answer: every day, and swearing. Why
31 than the tree frog jump high?
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32 Fifty-second face, his face still has a beard. What is the reason?
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44 family has a pig farmer and the donkey, the New Year when you slaughter a pig farmer or a donkey before?
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45 aircraft to fly so high why do not hit the stars?
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43 Xiao Ming's mother has three sons, called the Ming Great son, second son called out the second and third sons name? ● Of course, called the Little Ming
44 a young man, he had a river to go to work; However, the river no boat and no bridge. So he would swim across the river in the morning, only an hour's time he swam to the other side in the afternoon, the river width and flow rate are not changed, even more important is his swimming speed have not changed, but he had spent two and a half hours to swim across the river, you say why? ● two and a half hours add up to an hour
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61 people in what circumstances would Qiqiaoshengyan? ● Cremation
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70 is the end of the world tomorrow, and why some people want to commit suicide? ● go to heaven seats for
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78 a cow, walk 10 meters north, then west to go 10 meters, 10 meters and then go south, turn right back and asked where the cow's tail toward? ● North Korea to

79 ● The day after tomorrow

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95 four or five times a day to shave face, his face still has a beard. What is the reason? ● Pharaoh was a barber

96 a word, everyone will read the wrong met. What is this word? ● This is the Several side? ● Two side. Inside and outside
100 a month which has twenty eight days? ● Every month, 28 days