Study On The Effect Of Multi-Orifices Spiral Flow Energy Dissipation Equipment

In the pipe transport, the pressure in the pipe is the essential condition of transporting the flow energy, but sometime the ductwork is restricted by the landform,physiognomy and other conditions, in some pipes or definite conditions, the original pressure usually exceeds the energy dissipation of transport fluid, this part of surplus energies will damage the ductwork facilities if not be eliminated. Therefore, how to control the pressure in the pipe safely and conveniently becomes the concerned research topic now.This research study on the multi-orifices spiral flow energy dissipation equipment. This experiment integrate the single orifice energy dissipation installation and spiral flow's energy dissipation equipment, based on the fore people's research, newly try to study the energy dissipation method with spiral flow. In this experiment, selecting different work condition, include changing the space,the turn angle between different orifices and changing different discharge about the multi-orifices spiral flow energy dissipation equipment, obtains a great deal of data. On the foundation of analyzing these data, this research study on the energy dissipation efficiency, mechanism and influence factors of the energy dissipation equipment with multi-orifices spiral flow. The main contents are as followings:1. On the condition of different discharge, different turn angle and different distance ratio, measure the distance pressure figure of multi-orifices spiral flow energy dissipation equipment, we obtain a great deal of data, and analyze the resistance coefficient of the whole equipment. Through calculating the energy dissipation efficiency and comparing the original pressure, this experiment conclude that the best structure form and parameter is between the distance ratio 0-0.067, it can ensure the low pipe working pressure and the high energy dissipation efficiency at the same time.2. Based on analyzing the experimentation dates, this equipment is divided into four parts according sequence: the suddenly expanding pipe diameter segment, the orifice energy dissipation segment, the spiral flow energy dissipation segment, the suddenly contracting pipe diameter segment. In this experiment, we analyze and discuss the each segment, conclude that the forepart of the orifice and its along distance resistance loss may use the general energy dissipation calculation formula, while the latter part of the orifice and its along distance energy dissipation is larger than the calculation figure with the general energy dissipation calculation formula, because the together effect of the shoot flow and the spiral flow of the orifice. It should add the spiral flow energy dissipation loss to the general energy loss calculation figure with the formula. 3. Specially conclude the energy dissipation coefficient of the orifice energy dissipation segment, and simulate the equation of the change rule of the restrictive coefficient follow the turn angle. This provides a suit of having definite valuable calculation formula to more studies of the energy dissipation equipment.4. Using the dimension analysis principle, analyses the influence factor of this equipment. The main factor affecting energy dissipation coefficient K is Renault figure Re, aperture ratio d/D,distance ratio L/D and turn angle a .