| 摘要 |
The invention relates to a method of determining characteristics of orifices (O1, . . . , O9) to be made through a plate (2) positioned in a circuit (10) across the fluid passage. Said method comprises defining fluid data, the number of orifices, and for each orifice a control segment or area. The fluid flow rate through each orifice of the perforated plate is calculated, and for each orifice, the flow rate density is calculated by dividing said fluid flow rate by the associated control segment length or control area. The optimized or non-optimized nature of the orifice characteristic is determined by comparing said flow rate density with the mean flow rate density. If the difference in absolute value lies within a predetermined range of values, then the orifice characteristics are considered as being optimized. Otherwise at least one characteristic of at least some of the orifices is modified. |
| 主权项 |
1. A method of determining characteristics of orifices for making through a plate, said plate being for positioning in a circuit across the fluid passage, said method being comprising the steps of:
a) optionally, defining operational data of the circuit, which data comprises: the temperature of the fluid; and/or the pressure of the fluid; and/or the received heat flux; and/or gravity; b) defining fluid data, including the flow rate entering the circuit, written Q, and preferably the viscosity, and/or the compressibility, and/or the density of said fluid, as a function of the temperature of the fluid and/or the pressure of the fluid; c) defining characteristics relating to the orifices, said characteristics comprising:
the number of orifices, written N;for each orifice:
either a segment referred to as a “control segment” of length;or an area referred to as a “control area”,each control segment or area corresponding to subdividing at least a portion of the length, of the plate or of the area, of the plate such that the control segments or areas preferably join one another and contain the corresponding orifice;the diameter, or the area, of the fluid passage of each orifice; meshing said circuit of the plate with the corresponding orifices, together with one or more other elements, if any, present inside said circuit; e) determining the speed of the fluid stream in a plurality of meshes, preferably in each mesh, as a function of said fluid data, and preferably of said operational data of the circuit; f) calculating the fluid flow rate Q, through each orifice in the plate least as a function of the diameter or of the area of said orifice, and of the determined speed of the fluid stream at said orifice; g) calculating for each orifice the flow rate density by dividing the fluid flow rate by the length of the control segment or by the control area associated with said orifice, and calculating the mean flow rate density corresponding to the ratio of the incoming flow rate over the length or the area of the plate; and h) determining the optimum or non-optimum nature of the characteristics of the orifices of the plate, by:
for each orifice, comparing the flow rate density with the mean flow rate density; and
if, for each orifice, the difference in absolute value between the flow rate density and the mean flow rate density lies in a predetermined range of values, then the characteristics of the orifices are considered as being optimized; andotherwise:
modifying at least one of said characteristics of at least some of the orifices; andrepeating steps d) to h). |
