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Performance Characteristics of the Lysholm Engine

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Performance Characteristics of the Lysholm Engine ( performance-characteristics-lysholm-engine )

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c .Expcrimcntal Accuracy > . Ir . Nost individual component accuracies and how they were obtained have been e describedin the test equipment section. Theerrorin power output is due only to error in the torque and rpm readings. Thc torque reading was found by experiment t o be accurate t o 2 1.2 in-lb. Thc rpm reading was very accurate, but the rpin sometimes varied over the three data scans by as much as50. Being conservative then, the errorinrpmis225. Thesenumbersgiveaworsecaseaccuracyfordatarun #167,1/1W/S ratio, 3000 rpms, according to the formula of l.lO$. Actually, for this run, the rpm's varied only by 6. It is prob- ably safe t o say the accuracy of a l l power readings is within 2 l$. Mass flow rates, as shown i n tables 2 and 3, were found t o be accurate within Z$ f o r run conditions. The thermocouples are accurate to within ,half.a degree F, comes- t o enthalpies within 0.5 Btu/lbm. However, many of the m p h s pre- sent& t a c i t l y assume constant entha while values of hl may vary. 'Tie accuracies found statistically were, for 0/1 W/S -0.2% 1/1w/s -o.% I 2/1U/S -O.5$, 3/1U/S -0,4%, andfor5/lW/S-O,a!.Theerrorsare listed in Figures 18to21, These errors do not greatlv affect LLhs since the actual value of hl and h2 for'any one run is known within 0.5 Btu/lbm, thus ah is accurate t o within 1 Btu/lb, o r 0.25% a t 5/l #/So However, Figure 22 shows r\ de- t

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