Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Thu, 09 Oct 2003 18:24:09 -0400 Message-ID: X-Original-Return-Path: Received: from [24.93.67.82] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2630080 for flyrotary@lancaironline.net; Thu, 09 Oct 2003 11:04:21 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id h99F4ILe011697 for ; Thu, 9 Oct 2003 11:04:19 -0400 (EDT) X-Original-Message-ID: <005001c38e76$3dfbc0a0$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" Subject: Centrifugal Pump - Velocity Head Pressure Head X-Original-Date: Thu, 9 Oct 2003 11:01:38 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/plain"; boundary="----=_NextPart_000_004D_01C38E54.B663D9A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_004D_01C38E54.B663D9A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Tracy, Here is a URL on theory of Centrifugal Pump operation (with drawings and diagrams yet). http://wrc.chinalake.navy.mil/warfighter_enc/SHIPS/shipeng/pumps/pump.htm If I am interpreting what I quickly read, there is a pressure head and a velocity head. If the thermostat is open it looks like the velocity head absorbs the power, if the thermostat is closed it looks like the power is absorbed by maintaining a Pressure head. Here are some extracts: One of the most widely used non-positive displacement pumps is the centrifugal pump. It utilizes the throwing force of a rapidly revolving impeller. Liquid supplied to the center of the impeller or "eye" of the impeller discharges at the outer rim. In traveling this distance, the water or other fluid has acquired considerable velocity. A volute or a series of diffusing passages slow down the fluid. As the velocity of the liquid decreases, its pressure increases (velocity head decreases, pressure head increases). Pressure head (PH), also known as pump head, is the pressure produced at the discharge side of a pump. This pressure head must be great enough to overcome the head losses acting against it if the pump is going to move the fluid. Pressure head is inversely proportional to velocity head. Figure 2 Velocity head (VH) is the energy transferred to the fluid to impart a velocity upon it. Flow rate is a measure of velocity head (measured in gallons per minute or GPM). As stated above, velocity head and pressure head are inversely proportional to each other, meaning that as velocity head (flow rate) increases, pressure head (discharge pressure) decreases. Figure 2 shows this relationship for a typical centrifugal pump. Notice that when there is no flow through a pump, its pressure head is at its maximum value. This is the shut off head discussed earlier. So between Pressure Head and Velocity head it looks like the pump energy is absorbed by one or the other or some balance between the two. This figure would seem to imply that regardless of whether the water is flowing or not, there is kinetic energy being imparted by the pump to the water. If the thermostat is open this presumbaly turns into Velocity Head, if the thermostat is closed appearent this energy becomes Pressure Head. At least that is how it appears to me. Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_004D_01C38E54.B663D9A0 Content-Type: image/gif; name="image2.gif" Content-Transfer-Encoding: base64 Content-Location: http://wrc.chinalake.navy.mil/warfighter_enc/SHIPS/shipeng/pumps/images/image2.gif R0lGODlhIAHAAPf/AAAAAP39/QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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