Final answer:
In aircraft, oil pressure to the propeller is typically regulated by a propeller governor. Calculations based on a hydraulic press example provided a bulk strain of 0.00313 and a volume decrease of about 0.7825 liters due to an oil pressure increase of 2300 psi, after converting to atm and using oil's compressibility factor.
Step-by-step explanation:
How Units Regulate Oil Pressure in Propellers
To address your specific question regarding which unit regulates oil pressure to the propeller, it is generally the propeller governor that performs this function in aircraft. The governor controls the flow of oil and thereby regulates the pitch of the propeller blades to maintain a desired engine RPM or propeller speed. However, in the context of the hydraulic press information provided, we can address the calculation of bulk strain and volume decrease due to a pressure increase.
Given a 2300-psi pressure increase and a 250-liter volume of oil with a compressibility of 2.0 × 10-5/atm, we can calculate the bulk strain and absolute decrease in the volume of oil as follows:
First, convert the pressure increase from psi to atm: 2300 psi × (1 atm / 14.6959 psi) = 156.5 atm.
Next, calculate the bulk strain using the compressibility of oil: Bulk strain = compressibility × pressure change = 2.0 × 10-5/atm × 156.5 atm = 0.00313 (unitless).
Finally, calculate the absolute decrease in volume: Absolute volume decrease = initial volume × bulk strain = 250 L × 0.00313 = 0.7825 L.
Thus, the bulk strain is 0.00313 and the absolute decrease in volume is approximately 0.7825 liters when the hydraulic press is operating.