In order to ensure that the total flow channels of the fluid are similar in shape, we made a plexiglass model in a 1:1 ratio. As for the surface state of the channel, it plays a significant role in the flow state and velocity distribution of the nearby fluid, but it has little effect on the flow state and velocity distribution of the fluid far away from a certain distance. Although the plexiglass model has different resistance along with the actual sand, the local resistance is the main resistance for the gating system with short flow and complex shape, and the resistance along the way is negligible. The experimental device is mainly composed of two parts: (1) Water circulation system The entire water circulation system has two water tanks, one as a water supply tank above the support and the other as a storage tank under the test bench. After the experiment began, the motor was started and the water in the storage tank was lifted into the water supply tank. When the water level exceeds the height of the siphon tube, open the water supply control valve and start the experiment. (2) Experimental bench The experimental bench is mainly used to place the model so that the filling is stable and easy to control. It mainly includes water trays and boxes. Before simulating the pouring, the experimental device should be leveled and the sealing of each part checked. Only when the various conditions meet the requirements can the experiment be conducted. Conclusions (1) In some cases, hydraulic simulation is a good method to verify the gating system, and it can easily observe the pouring process. (2) Hydraulic simulation must ensure similar conditions. (3) The piston ring castings produced by the plant were verified by hydraulic simulation experiments, and the local dimensions were modified. The performance of all aspects will be better.
1,introduce
Fire truck, also known as fire engines, fire fighting truck, was used
to perform fire fighting tasks. The fire department in most of
the world will also use it for other emergency rescue purposes. Fire
engines can transport firefighters arrived at the scene of the disaster,
and to provide a variety of tools for the implementation of disaster
relief tasks. Modern fire engines usually equipped with ladders, water
gun, portable fire extinguishers, self-contained, protective clothing, rescue
tools, first aid kits and other equipment, the composition of vehicle is water tank, a water pump, foam fire extinguishing device and other
large fire equipment. Most of the fire truck appearance is red,
but there are also some of is yellow, at the top of the fire truck
usually has alarm sirens, lights and flashing lights. On the roof of a
siren and flashing lights.
2, including equipment:
Fire truck is carrying large variety of fire
equipment,including: Fire hose,Water collector,water thief,Hose reel,Hose wrench, Fire Hammer, Fire Axe and so on
3,classification
Common types of fire engine including water tank fire truck, foam fire truck, Foam-Powder combined fire truck, carbon dioxide fire truck, lift jet fire engines,
pumper fire engine, elevating platform fire trucks and ladder fire truck.
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