BPA

(redirected from Blade Pitch Angle)
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AcronymDefinition
BPABlanket Purchase Agreement
BPABusiness Process Automation
BPABusiness Professionals of America
BPABonneville Power Administration
BPABisphenol A
BPABuenas Practicas Agricolas (Spanish: Good Agricultural Practices)
BPABusiness Process Analysis
BPABradford Park Avenue (football club; UK)
BPABusiness and Public Administration (various schools)
BPABuilding Permit Application (various locations)
BPABest Player Available (sports draft picks)
BPABonnes Pratiques Agricoles (French: Good Agricultural Practices)
BPABeijing Platform for Action (est. 1995; China)
BPABuilding Performance Analysis
BPABénéfice Par Action
BPABusiness Process Architect
BPABusiness Practices Alignment
BPABurst Promoting Activity
BPABind Parameter Addresses
BPABuffer Pool Analyzer
BPABrighton Port Authority (music project)
BPABritish Parachute Association
BPABenefit Plan Administration
BPABrevet Professionnel Agricole (French: Professional Agricultural Certification)
BPABijzonder Plan van Aanleg (Dutch: Special Planning Scheme; Belgium)
BPABundespresseamt (German: Press and Information Office of the Federal Government)
BPABritish Pig Association
BPABlack Police Association (various locations)
BPABest Practice Advisory (healthcare)
BPABorder Patrol Agent
BPABest Poster Award
BPABritish Ports Association
BPABanca Privada d'Andorra
BPABushels per Acre (agricultural yield)
BPABusiness Professional Association (various organizations)
BPABachelor of Public Administration
BPABunbury Port Authority (Australia)
BPABelief Propagation Algorithm
BPABoardgame Players Association (Greenville, SC)
BPABanco Português do Atlântico
BPABand Parents Association
BPABenefit Plan Audit (various locations)
BPABaseline Performance Assessment (US DoD)
BPABasic Process Algebra
BPABanque Populaire des Alpes (French bank)
BPABusiness Process Assessment
BPABusiness Performance Award (Institute of Direct and Digital Marketing)
BPABusiness of Performing Audits (media auditing)
BPABanque Populaire Atlantique (French bank)
BPABridgeport Port Authority (Bridgeport, CT)
BPABachelor of Performing Arts
BPABoard of Professional Affairs
BPABachelor of Professional Arts (degree)
BPABlood Pattern Analysis
BPABowling Proprietors' Association of America
BPABlack Psychiatrists of America
BPABoost Pressure Actuator
BPABritish Philatelic Association
BPABowhunting Preservation Alliance
BPABusiness Process Activity(s)
BPABurst-Promoting Activity
BPABusiness Process Associates
BPABasic Purchase Agreement
BPABilateral Payment Arrangement
BPABritish Pyrotechnics Association
BPABigPond Advance (Telstra)
BPABusiness Planning Analyst
BPABratnia Pomoc Akademicka (Polish: Brotherly Help Academic)
BPABusiness Partners Alliance
BPABuckeye Pietenpol Association
BPABahnpostamt (German: course post office; German rail cancel)
BPABusiness Publications Audit of circulations
BPABritish Petroleum Amoco
BPABack Panel Assembly
BPABoulangeries Patisseries Associées (French bakery)
BPABlocked Precedence Announcement
BPABid Price Adjustment
BPABattlefield Psychological Activities
BPABudapesti Autonóm Gyülekezet (Hungary)
BPABusiness Pursuit Authorization
BPABlanket Purchase Authority
BPABretagne Pièces Auto (French automotive parts wholesaler)
BPABroadcast Promotion Association
BPABeiträge zur Physik Der Atmosphäre (Contributions to Atmospheric Physics)
BPABackprojection Algorithm
BPABaden Powell Award
BPABlade Pitch Angle
BPABayesian Predictive Adaptation
BPABroad Purchase Agreement (Navy)
BPABudget Project Account
BPABoston Process Approach
BPABilled Per Amount
BPABin Packing Algorithm
BPABackup Path Adjustment
BPABranch Planning Analysis
BPABernard Perreten Architecture, Inc (Vancouver, BC, Canada)
BPAGrumman-Bethpage Airfield (Bethpage, NY)
References in periodicals archive ?
It is noted that in practice the term of blade pitch angle is usually referred to as [theta] at the hub section of the blade, but in this paper [theta] at the mid-blade height is used as the blade pitch angle in order to determine the shaft power matching.
After the blade pitch angle shown in Figure 2 is determined and the deviation angle is obtained from Figure 10, the distribution of [[beta].sub.2F] and [[beta].sub.2R] can be calculated from Equation 1.
In order to further discuss the effects of k, the approximate optimum blade pitch angle [[theta].sub.R] can also be calculated using the guideline for k = 1.6, 1.7, 1.77, 1.9, and 2.0.
The authors analyzed the work done by two impellers of CRAFF using the method of velocity triangle and discovered that there exists a shaft power matching coefficient k, a tangent ratio of the relative outflow angles of two impellers, which not only determines the overloading of the rear impeller but also directly affects the flow rate and shaft power at design operation, the operation range of flow rate, and the blade pitch angle of the rear impeller.
Finally a guideline of shaft power matching for determining the approximate optimum of blade pitch angle of the two impellers is presented and applied to six different model fans for the same series of CRAFF.
Effect of k on the Approximate Optimum of Blade Pitch Angle of Rear Impeller ([degrees]) Fan A Fan B Fan C Fan D Fan E Fan F [[theta].sub.RC] (CFD) 19.5 24.5 18.5 21.5 20.8 23.3 [[theta].sub.RG] (k = 1.6) 22.0 28.6 18.5 24.2 20.7 26.9 [DELTA][[theta].sub.R] (k = 2.5 4.1 0.0 3.2 -0.1 3.6 1.6) [[theta].sub.RG] (k = 1.7) 20.9 27.2 17.5 23.0 19.6 25.6 [DELTA][[theta].sub.R] (k = 1.4 2.7 -1.0 1.5 -1.2 2.3 1.7) [[theta].sub.RG] (k = 1.77) 20.2 26.3 16.9 22.2 18.9 24.7 [DELTA][[theta].sub.R] (k = 0.7 1.8 -1.6 0.7 -1.9 1.4 1.77) [[theta].sub.RG] (k = 1.9) 18.9 24.8 15.9 20.9 17.8 23.3 [DELTA][[theta].sub.R] (k = -0.6 0.3 -2.6 -0.6 -3.0 0.0 1.9) [[theta].sub.RG] (k = 2.0) 18.1 23.7 15.2 20.0 17.0 22.3 [DELTA][[theta].sub.R] (k = -1.4 -0.8 -3.3 -1.5 -3.8 -1.0 2.0)
In order to determine the approximate optimum of blade pitch angles of two impellers, a guideline for shaft power matching is then presented.
* In order to reduce cost, all different-sized fans in the same series have only one set of blueprints, and blade profiles are scaled up or down, but the blade pitch angles are varied to match the rated power of motors.
Therefore, it is still of practical significance to come up with an effective guideline for shaft power matching, with which the optimum combination of blade pitch angles can be achieved easily and quickly.
But when the blade shape and rotating speed are determined, the magnitude of the shaft powers at different flow rates is only dependent on the blade pitch angles of the two impellers.
The blade pitch angles of the front and the aft propellers are both set as [[beta].sub.70] = 45.3[degrees].