US3776663A - Aerodynamic pressure-wave machine - Google Patents

Aerodynamic pressure-wave machine Download PDF

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Publication number
US3776663A
US3776663A US00284764A US3776663DA US3776663A US 3776663 A US3776663 A US 3776663A US 00284764 A US00284764 A US 00284764A US 3776663D A US3776663D A US 3776663DA US 3776663 A US3776663 A US 3776663A
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US
United States
Prior art keywords
rotor
cells
web
stator
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00284764A
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English (en)
Inventor
N Croes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3776663A publication Critical patent/US3776663A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F13/00—Pressure exchangers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/04—Arrangements for displaying electric variables or waveforms for producing permanent records

Definitions

  • An aerodynamic pressure-wave machine which includes a stator and a celled rotor, the stator being provided with gas inlet and outlets adjoining one side of the rotor at one end of the rotor cells and air inlets and outlets adjoining the opposite side of the rotor at the opposite end of the rotor cells.
  • the stator also includes a compression recess located after the air inlet, as viewed in the direction of rotation of the cells, and a web located in the gas outlet. This web extends radially for the entire height of the gas outlet and its width is approximately the same as one of the rotor cells. The function of the web is to cause pressure waves to impinge upon the compression recess at the highest and lowest speeds within the greatest part of the operating range of the machine.
  • the present invention relates to an aerodynamic pressure-wave machine of the type in which the gas inlet and the gas outlet are located on one side of the celled rotor, the air inlet and air outlet are located on the other side and wherein a compression recess is provided and located after the air inlet when viewed in the direction of rotation of the cells.
  • the principal object of the present invention is to achieve high-pre-compression of the air in the pressure-wave machine at high speeds, without unfavorably influencing the throughput at low speeds.
  • a web is located in the gas outlet in such a way that pressure waves emanating from this web over at least the greatest part of the operating range of the pressure-wave machine, and up to the highest speeds, impinge in the compression recess, and at the lowest speeds of the operating range impinge in the compression recess or on a wall between the compression recess and the air inlet.
  • the web in the gas outlet which retards the gases striking it at high velocity, particularly at high rotor speeds, gives rise to pressure waves which propagate through the cells to the other side of the rotor and there impinge in the compression recess, whereupon they raise its pressure level and so allow pre-compression of the air drawn from the air inlet and present in the cells.
  • the intensity of the pressure waves emanating from the web diminishes as the rotor speed decreases because the exit velocity of the gases also drops and hence the influence of the web on the process is similarly reduced.
  • the web is located so far into the gas outlet,
  • FIG. 1 is a developed projection of the rotor of the improved pressure wave machine together with the adjacent side portions of the stator;
  • FIGS. 2 and 3 are details from FIG. 1, and
  • FIG. 4 illustrates a variation of FIG. 3.
  • FIG. 1 shows the developed projection of the rotor l, of which only a few cells 2 are indicated, and which moves past the controlling edges of the stator in the direction shown by the arrow.
  • the side portions of the stator contain at one side of the rotor, i.e., at one end of the rotor cells the gas inlet 2v and the gas outlet 1n, and at the other side of the rotor the air inlet 1v the air outlet 2n and a compression recess 3 located after the air inlet as viewed in the direction of rotation of the cells.
  • a web 4 which extends radially over the entire height of the outlet and is preferably of approximately the same width as one cell.
  • the leaving gases flowing into the outlet impinge partly on the web 4, whereupon they are retarded, giving rise to a pressure increase which propagates as a pressure wave through the cell 2 to the other side of the rotor 1.
  • this pressure wave impinges in the compression recess 3, thus causing precompression of the air.
  • the pressure waves emanating from web 4 become progressively flatter, but still always impinge in the compression recess 3. It is important that even at the lowest speeds in the operating range of the pressure-wave machine they should not impede the intake of air, as would be the case if the pressure waves were to pass into the air inlet 1v.
  • the web 4 must therefore be so arranged that even at the lowest speeds the pressure waves emanating from it still impinge at least on the wall 5 between the compression recess 3 and air inlet 1v, as is shown in FIG. 3. If the compression recess 3 is somewhat larger in the direction of rotation, as indicated in FIG. 4, the web 4 can then be so arranged that the pressure waves still impinge in the compression recess 3 even at the lowest speeds.
  • the operating range of the pressure-wave machine here denotes that range of speeds within which the machine runs under normal operating conditions.
  • the starting process of the machine e.g., at low speeds beginning from zero, lies outside this range.
  • An aerodynamic pressure-wave machine comprising a stator, a celled rotor, said stator including a gas inlet and a gas outlet adjoining one side of said rotor at one end of the rotor cells, an air inlet and an air outlet adjoining the opposite side of said rotor at the opposite end of the rotor cells, a compression recess provided in said stator also adjoining said opposite end of said rotor and located after said air inlet as viewed in the direction of rotation of the cells, and a web provided by said stator and which is located in said gas outlet such that pressure waves emanating from said web over at least the greatest part of the operating range of said pressure-wave machine and up to the highest speeds within that range impinge upon said compression recess, and at the lowest speed with said operating range impinge upon said compression recess or on a wall portion of said stator located between said compression recess and said air inlet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supercharger (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00284764A 1971-10-19 1972-08-29 Aerodynamic pressure-wave machine Expired - Lifetime US3776663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1521571A CH537517A (de) 1971-10-19 1971-10-19 Aerodynamische Druckwellenmaschine

Publications (1)

Publication Number Publication Date
US3776663A true US3776663A (en) 1973-12-04

Family

ID=4407300

Family Applications (1)

Application Number Title Priority Date Filing Date
US00284764A Expired - Lifetime US3776663A (en) 1971-10-19 1972-08-29 Aerodynamic pressure-wave machine

Country Status (13)

Country Link
US (1) US3776663A (pl)
JP (1) JPS5332530B2 (pl)
AT (1) AT329320B (pl)
CA (1) CA954488A (pl)
CH (1) CH537517A (pl)
CS (1) CS191205B2 (pl)
DE (1) DE2154819C3 (pl)
FR (1) FR2157541A5 (pl)
GB (1) GB1354837A (pl)
IT (1) IT968997B (pl)
NL (1) NL162179C (pl)
PL (1) PL82165B1 (pl)
SE (1) SE373908B (pl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232999A (en) * 1975-10-10 1980-11-11 Bbc Brown, Boveri & Company, Limited Superchargers for internal combustion engines
US4288203A (en) * 1978-10-02 1981-09-08 Bbc Brown, Boveri & Company Limited Multi-flow gas dynamic pressure-wave machine
US7656504B1 (en) 1990-08-21 2010-02-02 Nikon Corporation Projection exposure apparatus with luminous flux distribution

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867981A (en) * 1956-05-09 1959-01-13 Ite Circuit Breaker Ltd Aerodynamic wave machine functioning as a compressor and turbine
US2904244A (en) * 1956-06-28 1959-09-15 Ronald D Pearson Pressure exchangers
US3120920A (en) * 1960-08-30 1964-02-11 Bbc Brown Boveri & Cie Pocket combination for extension for speed and load range of awm supercharger

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867981A (en) * 1956-05-09 1959-01-13 Ite Circuit Breaker Ltd Aerodynamic wave machine functioning as a compressor and turbine
US2904244A (en) * 1956-06-28 1959-09-15 Ronald D Pearson Pressure exchangers
US3120920A (en) * 1960-08-30 1964-02-11 Bbc Brown Boveri & Cie Pocket combination for extension for speed and load range of awm supercharger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232999A (en) * 1975-10-10 1980-11-11 Bbc Brown, Boveri & Company, Limited Superchargers for internal combustion engines
US4288203A (en) * 1978-10-02 1981-09-08 Bbc Brown, Boveri & Company Limited Multi-flow gas dynamic pressure-wave machine
US7656504B1 (en) 1990-08-21 2010-02-02 Nikon Corporation Projection exposure apparatus with luminous flux distribution

Also Published As

Publication number Publication date
ATA614472A (de) 1975-07-15
NL162179B (nl) 1979-11-15
NL7214044A (pl) 1973-04-25
GB1354837A (en) 1974-06-05
DE2154819A1 (de) 1973-04-26
FR2157541A5 (pl) 1973-06-01
IT968997B (it) 1974-03-20
NL162179C (nl) 1980-04-15
CA954488A (en) 1974-09-10
CH537517A (de) 1973-05-31
JPS5332530B2 (pl) 1978-09-08
PL82165B1 (pl) 1975-10-31
DE2154819C3 (de) 1975-07-03
AT329320B (de) 1976-05-10
DE2154819B2 (de) 1974-11-21
JPS4848862A (pl) 1973-07-10
SE373908B (pl) 1975-02-17
CS191205B2 (en) 1979-06-29

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