[Weekly Question] (Issue 4, 2009) — “WRC 107/297””
Thread Content
The theme of this issue is “WRC 107/297”. This issue focuses on discussion, with the analysis tool based on CaesarII. It is recommended to explore from the following aspects: 1. Mainly discuss how to input the relevant data 2. Show everyone through examples. 3. Other points that need attention during use. The discussion can take the form of written descriptions, screenshots, or input files (please indicate the version and describe the content of the input). I hope everyone will actively participate, discuss together, learn together, and improve together! This post was last edited by fanking on 2009-3-15 14:26]
The simulation of nozzles is divided into two categories: 1. Simulation for the equipment. It is implemented using pipes. There is no need to simulate the head. And the fixed end and moving end inside need to be entered. And the operating temperature and pressure of the device also need to be entered. It’s mainly the temperature, which affects the additional displacement. 2 Simulation of the mouth. Simulated through WRC. It includes the wall thickness and outer diameter of the equipment. The wall thickness should be entered as the thickness plus the reinforcement thickness. The path from the device center to the device edge is simulated using zero-gravity rigidity.
I think the head also needs to be simulated, because it has its own temperature and volume. I’ve been simulating it all along, but I’m not sure if it’s correct
How to simulate the head? Have I never seen a simulated head? Could someone upstairs explain how to simulate the head? Should it be built with rigidity or something else?
I followed the pipe specifications; otherwise, we would have to treat all the equipment as rigid components. In any case, the total length needs to be maintained, right? If the end cap isn’t used, won’t that result in a shorter length for thermal expansion?
The end cap should have little to do with the expansion length, right? The expansion in the y-direction is related to the vertical height. The expansion amount of x should be the length of the x-axis projection from the fixed point to the nozzle, multiplied by the linear expansion coefficient. The end cap should be outside the supports at the fixed and free ends. In that case, the length of the end cap should have nothing to do with the displacement amount of the mouth, right? This is my understanding; I would appreciate your guidance.
My understanding is that if the nozzle is on the head, the head must be taken into consideration.
If the nozzle is on the head, then it’s not possible to use a WRC nozzle for simulation, right? WRC can only be used to simulate nozzles where two cylinders intersect vertically; if the two cylinders are parallel, WRC cannot be used for simulation. For example, the nozzle at the top of the tower cannot be simulated using WRC. If it is also perpendicular to the equipment at the end cap, it should work. But I’ve never seen a nozzle like this. Hehe, maybe it’s because we don’t see each other often. Under what circumstances is it generally necessary to attach a vertical nozzle at the head?
The axis is parallel to the nozzle, so it’s not possible to use WRC to simulate the nozzle – that’s the situation right now. In this type of nozzle simulation, it is also a simplified simulation – of a rigid body, not a nozzle; generally, additional displacements are taken into account.
I’m not quite sure what you mean. Could you draw a diagram?
In fact, the WRC cannot be used to verify the stress on the nozzles on the head