《BS EN 299-2009 油压雾化喷嘴.角度和喷射特性的测定.pdf》由会员分享，可在线阅读，更多相关《BS EN 299-2009 油压雾化喷嘴.角度和喷射特性的测定.pdf（12页珍藏版）》请在三一文库上搜索。
1、 W - - - - - - - - - - %- - 7- 7 - 7- 7- J- 0,700 solid II 0,700 to 0,749 semi-solid III 0,750 to 0,799 semi-hollow IV 0,800 hollow 4.2 Testing of the index angle 4.2.1 Test equipment See 4.1.1. EN 299:2009 (E) 6 4.2.2 Test procedure See 4.1.2. 4.2.3 Processing of test data See 4.1.3. 4.2.4 Computat
2、ion of index angle The index angle for this standard is quantitatively defined as the 80 % angle. This is the angle according to Equation (1) corresponding to the inner angle where 80 % of the liquid volume is collected. 12 1 VV VV Y (1) where Y is the index angle; V is 50 %, if the 50 % index angle
3、 is to be computed, 80 %, if the 80 % index angle is to be computed; V1 is the cumulative volume in percent collected in all patternator compartments up to and including the compartment such that V1 is as large as possible without exceeding the value of 80 %, if the 80 % angle is computed, or withou
4、t exceeding 50 %, if the 50 % angle is computed; V2 is the cumulative volume in percent collected in all patternator compartments up to and including the compartment such that V2 is as small as possible but still exceeds the value of 80 %, if the 80 % angle is computed, or still exceeds the value of
5、 50 %, if the 50 % is computed; is the plane angle subtended by outer edge of compartment corresponding to V1; is the plane angle subtended by outer edge of compartment corresponding to V2. Table 2 Angle marking degrees Tested angle degrees 50 45 to 55 60 56 to 65 70 66 to 75 80 76 to 85 90 86 to 95
6、 100 96 to 105 EN 299:2009 (E) 7 Dimensions in millimetres Figure 1 EN 299:2009 (E) 8 Dimensions in millimetres Figure 2 EN 299:2009 (E) 9 Table 3 Tube No. Collected tube volume ml Cumulative volume % Plane angle degrees 1 2 1,923077 14,5 2 9 10,57632 28,5 3 14 24,03846 41,7 4 22,5 45,67308 53,9 5 2
7、5 69,71153 64,8 6 14,5 83,65384 74,6 7 5,5 88,9423 83,3 8 3 91,82691 90,9 9 2,5 94,23076 97,6 10 2 96,15384 103,6 11 2 98,07692 108,8 12 2 100,0 113,5 13 0 100,0 121,3 14 0 100,0 128,5 EXAMPLE Example showing collected liquid volumes, conversion to cumulative percent volume, and corresponding plane
8、angles: Test references: oil burner nozzle “Hollow“ 0,85 GPH 60 Pressure: 10 bar The test shall be performed with a reference oil as defined in EN 293. Total volume collected = 104,0 ml The plane angle at 50 % (deg.) = 55,86201 The plane angle at 80 % (deg.) = 72,03173 The 50 % / 80 % cumulative vol
9、ume plane angle ratio = 0,7755194 4.3 Explanations The determination of spray angle by observation, photography, or by use of a protractor device (goniometer) is likely to produce erratic and non-repeatable result due to differences in instrumentation and test procedures. This has led to significant variations among nozzles marketed by different manufacturers, even though the nominal angle ratings may be identical. Index angles defined and calculated in this way are likely to exceed those values determined visually or by angle measurement devices.