Head cover radius of curvature
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The head has two radii of curvature, R1 and R2. Question 1: How are these two radii of curvature determined? 2. What is the relationship between them? 3. What is the definition of these two radii?
It depends on what type of end cap it is – elliptical, butterfly? For a standard ellipse, R is approximately 0.9 times D, and r is approximately 0.17D. There are more butterfly shapes.
For the elliptical head, the origins of the two formulas defined in 151 could not be found.
There is a derivation process for this; the first radius of curvature is derived from ds/dq. But I forgot how to get the second radius of curvature.
May I ask, what are the definitions of the first and second radius of curvature?
Direct seizure standard GB25198