Method and device for regulating the cooling of oil in a turbomachine

Patent metadata

Field	Value
Publication number	US-2016003148-A1
Application number	US-201414770681-A
Country	US
Kind code	A1
Filing date	Feb 24, 2014
Priority date	Feb 27, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A method for regulating oil cooling within an oil cooling device of a turbomachine including a first heat exchanger mounted in series with a second heat exchanger, the first heat exchanger being an oil/air exchanger while the second heat exchanger is an oil/fuel exchanger, each heat exchanger having an oil inlet and an oil outlet, a bypass directly connecting the oil inlet of the first heat exchanger to the oil outlet of the first heat exchanger, and a flow regulator to regulate the flow rate of oil flowing through the bypass. Circulation of oil though the bypass is allowed by means of the flow regulator when the oil temperature is less than or equal to a predetermined temperature comprised between 70° C. and 90° C., preferably equal to about 80° C.

First claim

1 - 7 . (canceled)

8 . A method for regulating oil cooling within an oil cooling device of a turbomachine including a first heat exchanger mounted in series with a second heat exchanger, the first heat exchanger being an oil/air exchanger while the second heat exchanger is an oil/fuel exchanger, each heat exchanger having an oil inlet and an oil outlet, a bypass directly connecting the oil inlet of the first heat exchanger to the oil outlet of the first heat exchanger, and a flow regulator to regulate the flow rate of oil flowing through the bypass, wherein circulation of oil through the bypass is allowed using the flow regulator when the temperature of the oil is less than or equal to a predetermined temperature comprised between 70° C. and 90° C., preferably equal to about 80° C.

9 . The method according to claim 8 , wherein circulation of oil through the bypass is also allowed when the ratio between the nominal head loss of the first heat exchanger and the effective head loss between the oil inlet and the oil outlet of the first heat exchanger is less than or equal to a predetermined ratio comprised between 0.7 and 0.9, preferably 0.8.

10 . The method according to claim 9 , wherein the flow rate of oil circulating through the bypass, when the ratio is less than or equal to the predetermined ratio while the temperature of the oil is greater than the predetermined temperature, is less than the flow rate of oil circulating through the bypass when the temperature of the oil is less than the predetermined temperature.

11 . The method according to claim 9 , wherein the circulation of oil through the bypass is blocked using the flow regulator when the temperature of the oil is greater than the predetermined temperature while the ratio is greater than the predetermined ratio.

12 . The method according to claim 10 , wherein the circulation of oil through the bypass is blocked using the flow regulator when the temperature of the oil is greater than the predetermined temperature while the ratio is greater than the predetermined ratio.

13 . An oil cooling device for a turbomachine including a first heat exchanger mounted in series with a second heat exchanger, the first heat exchanger being an oil/air exchanger while the second heat exchanger is an oil/fuel exchanger, each heat exchanger having an oil inlet and an oil outlet, a bypass directly connecting the oil inlet of the first heat exchanger to the oil outlet of the first heat exchanger, and a flow regulator to regulate the flow rate of oil flowing through the bypass, wherein the flow regulator includes a thermal valve, said thermal valve being configured to be open when the oil temperature is less than a predetermined temperature comprised between 70° C. and 90° C., preferably equal to about 80° C.

14 . The device according to claim 13 , wherein the flow regulator includes a pressure valve, said pressure valve being configured to be open when the ratio between the nominal head loss of the first heat exchanger and the effective head loss between the oil inlet and the oil outlet of the first heat exchanger is less than or equal to a predetermined ratio comprised between 0.7 and 0.9, preferably 0.8.

15 . A turbomachine including an oil cooling device according to claim 13 .

Assignees

• Snecma

Inventors

• Gameiro Sebastien
• Andre Brice
• Mathon Margueritte Guillaume
• Potel Nicolas

Classifications

• F02C7/14 Primary

  of fluids in the plant {, e.g. lubricant or fuel (F02C7/185 takes precedence)} · CPC title

• F02C7/00 Primary

  Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants (controlling F02C9/00) · CPC title

• F02C7/224

  Heating fuel before feeding to the burner · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title