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Engine pressure ratio
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<h2 id="integrated-engine-pressure-ratio">Integrated engine pressure ratio</h2> <p>The integrated engine pressure ratio (IEPR) is a ratio used on some <a href="/facts/Turbofan/x8XWVw19">turbofans</a> to include fan discharge total pressure and compressor inlet total pressure. If compressor inlet pressure is P0 and fan discharge total pressure is P1, then the integrated engine pressure ratio will be P1 /P0.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p><p>The IEPR is an engine indicator system unique to the <a href="/facts/Rolls-Royce_RB211/v9mN1USx">Rolls-Royce RB211</a>. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Jet_engine_performance/kJzC06AK">Jet engine performance</a></li> <li><a href="/facts/Turbofan/x8XWVw19">Turbofan</a></li></ul> <ul><li>The Boeing Company <i> Engine thrust control system </i> <a href="https://patents.google.com/patent/US4248042">US Patent 4248042</a> Includes <a href="/facts/Boeing/tF5sMe9F">Boeing</a>'s discussion on EPR or IEPR being a better indicator of thrust.</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.grc.nasa.gov/WWW/K-12/airplane/epr.html">Pressure Variation EPR - NASA Animation</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Glenn Research Center (NASA). "Pressure variation - EPR". Retrieved January 2, 2015. <a href="https://www.grc.nasa.gov/WWW/k-12/airplane/epr.html" target="_blank">https://www.grc.nasa.gov/WWW/k-12/airplane/epr.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Engine Pressure Ratio (EPR)". code7700.com. Archived from the original on 2014-10-04. <a href="https://web.archive.org/web/20141004201047/http://code7700.com/epr.html" target="_blank">https://web.archive.org/web/20141004201047/http://code7700.com/epr.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"integrated engine pressure ratio". aviation_dictionary.en-academic.com. Retrieved 2023-06-07. <a href="https://aviation_dictionary.en-academic.com/3854/integrated_engine_pressure_ratio" target="_blank">https://aviation_dictionary.en-academic.com/3854/integrated_engine_pressure_ratio</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>