mac lipstick Orifice spillway gate shutting Accide

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Orifice spillway gate shutting Accident Study

Abstract: in the spillway gate shutting accident process, the hole may have a huge noise and strong vibrations. In order to ensure the safe operation of orifice tunnels, on the basis of theoretical analysis, on the orifice hole course of the accident gate shutting in the experimental study. Test, measurement of the spillway along the pulse pressure, emergency gate doors imported wind speed well, and observed the flow pattern and the plate hole analysis of the causes of noise and vibration chamber and the corresponding measures .
Keywords: orifice tunnels emergency gate pulse pressure in the chamber experimental study

) excretion to flow. When the project is completed,[link widoczny dla zalogowanych], the diversion tunnel of the diversion mission has been completed. To save project investment, the conditions permit, \facilities such as dissipation, or orifice. Under normal circumstances, the normal operation of spillway, the hole flow stability, a smooth tongue of water in the chamber exit,[link widoczny dla zalogowanych], there were no flow phenomenon. However, if the gate failure can not be the normal closure of gate shutting by accident when, in the press section of Discharge possible alternate next full flow state, and in the hole and the gate noise and vibration indoor Chanshengjiaoda sense. To study the orifice hole to be running during an emergency closure of emergency gate of special circumstances, it will have adverse flow conditions or in the body hole chamber have a devastating impact, the paper based on the theoretical analysis carried out orifice spillway gate shutting Accident Study.

<P Class=MsoNormal style=\ 1 in, take 1-1 section, and 2-2 section, under the gate at the emergency gate of the process of ( emergency gate spillway gate from the entrainment of air well before the ) , ignoring inertia due to head loss and head loss along the way, the establishment of the energy equation, there is
<TD Style=\<P Class=MsoNormal style=\
Z 1 for the reservoir water level, V 1 for the reservoir area 1-1 section of the approach velocity, Z 2 the door for the emergency gate of the well water level, V 2 the door for the emergency gate of the well water level changes in speed, h w for the 1-1 section and 2-2 section between the local head loss, mainly caused by the emergency gate, if the Department ignored emergency gate flow of the local head loss coefficient ξ changes,[link widoczny dla zalogowanych], h w can be approximately expressed as:
<TD Style=\<P Class=MsoNormal style=\
Q , A were accident Office spillway gates and over the flow of water area; e for the emergency gate opening; Q 2 for the emergency gate of the door fell well as imported water discharge tunnel traffic; Q 3 is discharged through the gate of the flow. Ignore the line near the reservoir area and the emergency gate of the door head speed rate of the well head, and taking into account Q 2 <SPAN style = \-FAMILY: Arial \<SPAN style=\
<TD Style=\<P Class=MsoNormal style=\
<P Class=MsoNormal style=\Under the emergency gate gate process, with emergency gate opening e The gradual decrease in water level in wells emergency gate door Z 2 will gradually reduce, immediately fell on the edge of a critical spillway elevation Z c near the emergency gate of the door wells will be involved in the discharge of air hole. In the reservoir water level Z 1 some cases, the work of the smaller gate opening through the gate of the discharged volume of the Q 3 smaller, Z c reduced to Z c the required e smaller, that is, entrainment of air occurred more time later. in mind the role of head H = Z 1 -Z 3 (Z 3 in the chamber for the discharge gate of the central section elevation ) , similar to that ( η can be approximated as emergency gate opening and gate opening function ) , substituted into the equation can be obtained:
<TD Style=\<P Class=MsoNormal style=\
<P Class=MsoNormal style=\gate's open for some of the case, if the emergency gate of the next gate in the same way, then the role of head H higher, Z 2 reduced to Z c the required e more small, the entrainment of air occurs the later time. <SPAN style=\body \: 11.5pt; FONT-FAMILY: Arial \Upper level cooling towers pool long 6m , high 6.5m , width 1.7m , corresponding to the side of the imports in the construction of spillway has 3 months overflow ports, respectively, control 3.48m, 4.12m , 5.12m The model of the role of head,[link widoczny dla zalogowanych], and each simulation is equivalent to 87m , 103m , and 128m prototype function head ( equivalent model scale 1:25) . Orifice hole by the 15mm glass making, with the glass plate made by the lathe. Emergency gate crafted by the inverter, motor, reducer, Volume cable machine, trip switches and other equipment control. Weir downstream capacity long 10m , width 1.05m , high 1.5m , model for measuring traffic. Experimental observation of different effects will head (87m , 103m , 128m) and different work in chamber gate opening (1.0 , 0.8 , 0.5 , 0.25) section of fluid under test, test incident and the downstream chamber section of the door slot and cave along the pressure distribution, flow,[link widoczny dla zalogowanych], accidents Mun ventilation, wind speed, the accident and the bottom edge of the door leaf gate downstream pressure and pulse pressure all the time. Based on the test result analysis hazardous hydrodynamic load of the formation, evaluation of its harmful levels of buildings, for the accident gate shutting operations for the prevention of unhealthy measures.
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