Claims
- 1. A device for compressing a multiphase fluid having a liquid phase and a gaseous phase comprising:
- a housing; and
- an impeller having a inlet section and an outlet section, a hub and a number n of blades equal to or greater than 2 with the blades rotating around an axis, the blades having a leading edge and a trailing edge with the fluid entering into the impeller via the inlet section and leaving the impeller via the outlet section with the axis being oriented in a direction of advance of the fluid, and at least one channel defined by two successive blades having an orthoradial section equal to or less than 5% of a quantity S(x) where
- S(x)=ax.sup.2 +b(c-x.sup.2).sup.1/2 +d
- along at least a portion of a length of the channel with the portion being between two orthoradial planes and the variable x corresponding to the absciss along the axis between points x.sub.1 and x.sub.2 and having an origin corresponding approximately to a radial plane passing through the leading edge of the blades with the planes defining the portion and a, b, c and d being parameters.
- 2. A device according to claim 1, wherein:
- a=.pi./n.
- 3. A device according to claim 1, wherein:
- b equals (l/n) [2.pi.M+e/sinB.sub.c ];
- c equals (M-R.sub.1).sup.2 ; where
- M equals (l.sup.2 +R.sub.3.sup.2 -R.sub.1.sup.2)/[2(R.sub.3 -R.sub.1)];
- e is a blade thickness;
- B.sub.c is a cord angle;
- l is an axial length of the blades;
- R.sub.1 is a minimum radius of the blades at the inlet section;
- R.sub.2 is a maximum radius of the blades at the inlet section; and
- R.sub.3 is minimum radius of blades at the outlet.
- 4. A device according to claim 3, wherein:
- d=(l/n)[(R.sub.2 -M)(.pi.(R.sub.2 +M)+e/sin B.sub.c)-(M-R.sub.1).sup.2 ].
- 5. A device according to claim 1, wherein:
- the blades have one upper edge being inscribed in a revolution cylinder having an axis Ox as an axis of symmetry.
- 6. A device according to claim 1, wherein:
- the portion corresponds to an entire length of the channel.
- 7. A device according to claim 1, wherein:
- the portion corresponds to a length between 80 to 90% of a length of the impeller.
- 8. A device according to claim 1, wherein:
- inlet angles of the blades for an intrados face are between 4.degree. and 24.degree. and for an extrados face between 2.degree. and 23.degree..
- 9. A device according to claim 8, wherein:
- the inlet angles of the blades for the intrados face are between 4.degree. and 12.degree. and for the extrados face between 2.degree. and 11.degree..
- 10. A device according to claim 1, wherein:
- a recess of the blades is between 0.degree. and 30.degree..
- 11. A device according to claim 10, wherein:
- the recess of the blades is between 6.degree. and 12.degree..
- 12. A device according to claim 1, wherein:
- a mean thickness of the blades is between 3 and 5 mm outside neighboring zones of the leading and trailing edges.
- 13. A device according to claim 1, wherein:
- n is between 3 and 8 including blades of area limiters.
- 14. A device according to claim 13, wherein:
- n is between 4 and 6.
- 15. A device according to claim 1, wherein:
- the blades have an intrados face outlet angle of between 4.degree. and 54.degree. and an extrados face angle between 2.degree. and 58.degree..
- 16. A device according to clam 15, wherein:
- the intrados face outlet angle is between 10.degree. and 24.degree. and the extrados face angle is between 8.degree. and 23.degree..
- 17. A device according to claim 1, wherein:
- a mean profile of the blades defined by an intersection of a blade of minimal thickness and having a cylindrical surface in relation to the axis is such that an angle of a mean profile formed with the axis decreases monotonically from the leading edge towards the trailing edge and a curve along the profile of a blade is a function of absciss curves at a slope having a value increasing from the leading edge towards the trailing edge of the blade.
- 18. A device according to claim 17, wherein:
- the curve has one reversal point.
- 19. A device according to claim 1, further comprising:
- a diffuser.
- 20. A device according to claim 19, wherein:
- the diffuser comprises blades.
- 21. A device according to claim 20, wherein:
- the diffuser comprises between 8 and 30 blades.
- 22. A device according to claim 21, wherein:
- the diffuser comprises between 15 and 25 blades.
- 23. A device according to claim 19, wherein:
- a hub of the diffuser has a form of revolution around an axis Ox and wherein a line in an axial plane generating the form of revolution has at least one reversal point.
- 24. A device according to claim 23, wherein:
- the line has tangents parallel to the axis at two extremities of the line.
- 25. A device according to claim 1, wherein:
- a ratio of axial length of the impeller in relation to an outer diameter of the impeller is between 0.10 and 0.40.
- 26. A device according to claim 25, wherein:
- the ratio is between 0.15 and 0.20.
- 27. A device in accordance with claim 1, comprising a multiphase pump.
Priority Claims (1)
Number |
Date |
Country |
Kind |
90 09607 |
Jul 1990 |
FRX |
|
Parent Case Info
This is a continuation of application Ser. No. 943,986 filed Sep. 11, 1992 now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2157437 |
Jun 1973 |
FRX |
2333139 |
Jun 1977 |
FRX |
2471501 |
Jun 1981 |
FRX |
1263914 |
Oct 1986 |
SUX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
943986 |
Sep 1992 |
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