Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
A centrifugal compressor having a group of diffusing flow passages bounded by two generally radial side walls and by a group of vanes having a generally tangential direction mounted between the two side walls thus defining the diffusing flow passages, each passage having an entrance at a diameter "E" and an exit at some larger diameter, each passage having a predetermined area at the entrance and a predetermined area at the exit greater than the area at the entrance, wherein the improvement comprises a progressive variation of passage area from entrance to exit according to a specified area schedule so as to control the diffusion rate to a value less than 0.07 and to cause a relatively constant change in the pressure rise ratio for each unit of flow path length; the said area schedule and diffusion rate being defined according to the formula, ##STR1## P sx is static pressure at any point x selected along the diffuser passage, P sE is static pressure at the diffuser entrance at diameter E, L x is diffuser path distance from the entrance at diameter E to the point x measured along the diffuser vane centerline, and W E is diffuser passage width at the diffuser entrance at diameter E measured between the side walls perpendicularly to the flow path.
Claim 2
Dependent Claim
217 words
A centrifugal compressor having a group of diffusing flow passages bounded by two generally radial side walls and by a group of vanes having a generally tangential direction mounted between the two side walls thus defining the diffusing flow passages, each passage having an entrance at a diameter "E" and an exit at some larger diameter, each passage having a predetermined area at the entrance and a predetermined area at the exit greater than the area at the entrance, wherein the improvement comprises a progressive variation of passage area from entrance to exit according to a specified area schedule so as to control the diffusion rate to a value less than 0.07 and to cause a relatively constant change in the pressure rise ratio for each unit of flow path length; the said area schedule and diffusion rate being defined according to the formula, ##STR1## P sx is static pressure at any point x selected along the diffuser passage, P sE is static pressure at the diffuser entrance at diameter E, L x is diffuser path distance from the entrance at diameter E to the point x measured along the diffuser vane centerline, and W E is diffuser passage width at the diffuser entrance at diameter E measured between the side walls perpendicularly to the flow path.
Claim 3
Dependent Claim
178 words
A radial diffuser having the divergence characteristics of the vanes and side walls, wherein the spirally shaped diffuser vanes having a centerline with a spiral angle at the diffuser entrance and a lesser spiral angle at the diffuser exit, and having a centerline shaped essentially according to the following polar equation: R.sub.s = R.sub.E e.sup.z Where, R s = the radius from the geometric center of the diffuser diameter, to any selected point s on the spiral R e = the radius from said center to a point E the starting point of the spiral, e = a well known mathematical constant 2.71828, z = 0.01745 θ° × tan (Q E -CQ E θ°) Where, θ° = the angular distance between the two radial lines, one from the centerpoint to point E and the other being a radial line from the centerpoint to point s on the spiral Q e = spiral angle at point E C = an arbitrary value between 0.0025 and 0.0015 determined by trial and error to obtain (the desired) parallelism between adjacent vanes.
Claim 4
Dependent Claim
178 words
A radial diffuser having the divergence characteristics of the vanes and side walls, wherein the spirally shaped diffuser vanes having a centerline with a spiral angle at the diffuser entrance and a lesser spiral angle at the diffuser exit, and having a centerline shaped essentially according to the following polar equation: R.sub.s = R.sub.E e.sup.z Where, R s = the radius from the geometric center of the diffuser diameter, to any selected point s on the spiral R e = the radius from said center to a point E the starting point of the spiral, e = a well known mathematical constant 2.71828, z = 0.01745 θ° × tan (Q E -CQ E θ°) Where, θ° = the angular distance between the two radial lines, one from the centerpoint to point E and the other being a radial line from the centerpoint to point s on the spiral Q e = spiral angle at point E C = an arbitrary value between 0.0025 and 0.0015 determined by trial and error to obtain (the desired) parallelism between adjacent vanes.