PRELIMINARY STEADY-STATE SUBWAY AERODYNAMIC ANALYSIS (INCOMPRESSIBLE) - INTERIM REPORT

FIVE ANALYTICAL MODELS ARE DEVELOPED FOR USE IN AN EXAMINATION OF THE AERODYNAMIC CHARACTERISTICS OF VARIOUS TUBE-VEHICLE SYSTEMS. MODEL I IS THE BASIC STEADY-STATE, INCOMPRESSIBLE THEORY WHICH GIVES A DETAILED DESCRIPTION OF THE NEAR-FIELD REGION ABOUT A VEHICLE TRAVELING A TUBE WITH NO VENTS OR INTERCONNECTIONS WITH OTHER TUBES. A COMPUTER PROGRAM TO CALCULATE AERODYNAMIC CHARACTERISTICS WITHIN THESE PARAMETERS HAS BEEN OPERATIONALIZED. MODEL II ASSUMES TUBE-VEHICLE SYSTEMS IN UNSTEADY OPERATIONS IN AN INCOMPRESSIBLE FLUID. IN THIS SITUATION, THE FLUID MOTION LAGS THAT OF THE DYNAMIC VEHICLE, AND CONSEQUENTLY ALTERS THE DRAG FORCE EXPECTED FOR THE STEADY-STATE CASE. MODEL II IS CONSIDERED A MORE REALISTIC DESCRIPTION OF SUBWAY SYSTEM CHARACTERISTICS, AND A COMPUTER PROGRAM FOR ITS APPLICATION HAS BEEN OPERATIONALIZED. MODEL III CALCULATES THE AERODYNAMICS OF A VEHICLE IN A VENTED SINGLE-TUBE SUBWAY CONFIGURATION, ASSUMING INCOMPRESSIBLE, STEADY-STATE MOTION. THIS REPRESENTS THE TYPICAL SUBWAY TUBE SYSTEM AND IS AN EXTENSION OF THE MODEL I FORMULAE TO INCLUDE THE EFFECTS OF VENTS TO ATMOSPHERE ALONG A SINGLE TUBE SEGMENT. MODEL IV CALCULATES THE AERODYNAMICS OF A VEHICLE IN A TUBE INTERCONNECTED TO A PARALLEL TUBE (BUT NOT VENTED TO ATMOSPHERE). A FIFTH MODEL IS USED TO EXAMINE THE AERODYNAMIC EFFECTS OF MULTIPLE VEHICLES IN STEADY-STATE MOTION; IN THIS FORMULATION, AN EXTRA NEAR-FIELD FLOW CALCULATION MUST BE MADE FOR EACH ADDITIONAL VEHICLE. THE THEORETICAL FORMULATION OF THE FIVE BASIC ANALYTICAL MODELS ALONG WITH SUPPORTING ANALYSIS OF THE EXPERIMENTAL DATA ARE DISCUSSED IN THE REPORT. /UMTA/

  • Supplemental Notes:
    • PROJ NO DC-MTD-7
  • Corporate Authors:

    California Institute of Technology

    1201 East California Street
    Pasadena, CA  USA  91125
  • Publication Date: 1971-5

Subject/Index Terms

Filing Info

  • Accession Number: 00242080
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Nov 7 1981 12:00AM