1、November 2009DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 27.060.10!$ZO“1555844w
2、ww.din.deDDIN EN 299Oil pressure atomizing nozzles Determination of the angle and spray characteristicsEnglish version of DIN EN 299:2009-11ldruckzerstuberdsen Prfung der Sprhcharakteristik und des WinkelsEnglische Fassung DIN EN 299:2009-11SupersedesDIN EN 299:1998-11www.beuth.deDocument comprises
3、pages11DIN EN 299:2009-11 National foreword This standard has been prepared by Technical Committee CEN/TC 47 “Atomizing oil burners and their components Function Safety Testing” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Heiz- und Rau
4、mlufttechnik (Heating and Ventilation Technology Standards Committee), Technical Committee NA 041-01-61 AA lzerstubungsbrenner und ihre Komponenten (SpA CEN/TC 47). Amendments This standard differs from DIN EN 299:1998-11 as follows: a) The test equipment in Figure 1 is now dimensioned. b) (German v
5、ersion only) Equation 1 relating to the computation of the index angle has been corrected. Previous editions DIN 4790: 1985-09 DIN V ENV 299: 1992-06 DIN EN 299: 1998-11 2 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 299August 2009ICS 27.060.10 Supersedes EN 299:1998 English VersionOil pressure
6、 atomizing nozzles - Determination of the angle andspray characteristicsGicleurs sans retour pour brleurs fioul domestique pulvrisation - Dtermination de langle et descaractristiques de pulvrisationldruckzerstuberdsen - Prfung der Sprhcharakteristikund des WinkelsThis European Standard was approved
7、by CEN on 23 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards
8、 may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the
9、CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
10、s, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any for
11、m and by any means reservedworldwide for CEN national Members.Ref. No. EN 299:2009: EEN 299:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Testing 4 4.1 Testing of the radial distribution/spray pattern 4 4.1.1 Test equipment 4 4.1.2 Test procedure
12、 .5 4.1.3 Processing of test data .5 4.1.4 Spray uniformity and angle ratio 5 4.1.5 Classification of pattern types .5 4.2 Testing of the index angle 5 4.2.1 Test equipment 5 4.2.2 Test procedure .6 4.2.3 Processing of test data .6 4.2.4 Computation of index angle .6 4.3 Explanations .9 DIN EN 299:2
13、009-11 EN 299:2009 (E) 3 Foreword This document (EN 299:2009) has been prepared by Technical Committee CEN/TC 47 “Atomizing oil burners and their components - Function - Safety - Testing”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standar
14、d, either by publication of an identical text or by endorsement, at the latest by February 2010, and conflicting national standards shall be withdrawn at the latest by February 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
15、 CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 299:1998. The main change from the previous edition is that the test equipment in Figure 1 is now dimensioned. According to the CEN/CENELEC Internal Regulations, the national
16、standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Polan
17、d, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 299:2009-11 EN 299:2009 (E) 4 1 Scope This European Standard specifies a method for the determination of the spray characteristic and the index angle of oil pressure atomizing nozzles. 2 Normative ref
18、erences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 293, Oil pressure atomizing nozzles Mi
19、nimum requirements Testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 radial spray distribution-spray angle variation in liquid flux when proceeding from the nozzle axis to the edge of the conical spray pattern at a specified distance fr
20、om the atomizer 3.2 index angle Y plane angle formed by a conical spray, wherein the magnitude of the angle is determined by a specified percentage, e.g. 80 %, of the total volume of liquid collected in a radial patternator 3.3 cumulative volume aggregate volume of liquid, expressed as a percentage
21、of the total volume collected in a radial patternator, when proceeding from the spray axis (centre of the patternator) to the edge of the spray pattern 3.4 radial patternator device comprising a series of concentric annular compartments with a row of collection cylinders that is capable of measuring
22、 the radial spray distribution, as defined in 3.1 3.5 index arbitrary number assigned to a group of oil burner nozzles having similar spray patterns EXAMPLE “I“ indicating “solid“, see Table 1. 4 Testing 4.1 Testing of the radial distribution/spray pattern 4.1.1 Test equipment The radial patternator
23、, as shown in Figures 1 and 2, shall be a cylindrical vessel having a bottom plate comprising 14 concentric dividers that provide annular compartments from which liquid may be drained into graduated collection cylinders. DIN EN 299:2009-11 EN 299:2009 (E) 5 During testing, the top of the vessel shal
24、l be covered with a lid at whose centre a nozzle holder shall be mounted, which shall be vertically adjustable, so that the specified distance can be maintained between the nozzle orifice and the upper bevelled edges of the dividers. Means shall be taken to ensure that the annular compartments and c
25、ollection cylinders are not exposed to the spray prior or subsequent to the period designated for the collection of liquid. 4.1.2 Test procedure The nozzle to be tested shall be mounted in the nozzle holder. The latter shall be adjusted so that the axial distance between the nozzle orifice and the u
26、pper edges of the dividers is 50 mm. Testing shall be conducted with a reference oil as specified by EN 293. The total volume atomized during each test shall be at least 80 ml and shall in any case be sufficient to provide representative quantities of liquid in the collection cylinders. At the concl
27、usion of each test, the liquid volumes in each cylinder shall be recorded. 4.1.3 Processing of test data The recorded liquid volumes shall be tabulated along with the corresponding cumulative percentage volumes (see Table 3). Using the listed plane angles for each annular compartment, the cumulative
28、 volume (starting at the centre of the patternator) may be correlated with the plane angle subtended by that volume. Using this procedure, the continuous radial distribution may be represented in tabular or graphical form. 4.1.4 Spray uniformity and angle ratio The radial mass-distribution is a meas
29、ure of spatial uniformity at a specified distance from the atomizer. For example, a nozzle with “solid“ spray pattern is relatively uniform, whereas a nozzle with “hollow“ spray pattern is characterized by a high concentration of liquid at the outside of the spray cane. An indication of uniformity o
30、r pattern type can be given by calculating the 50 % / 80 % angle ratio. The two angles which correspond to the 50 % and 80 % cumulative volumes respectively may be determined by linear interpolation between the values (see Table 3) that bracket the 50 % and 80 % points in Table 3 (see 4.2.4). 4.1.5
31、Classification of pattern types The defined angle ratio shall be the basis for classifying spray pattern to the arbitrary indices in Table 1. Table 1 Index 50 % / 80 % angle ratio Qualitative description of spray pattern I 0,700 solidII 0,700 to 0,749 semi-solidIII 0,75 to 0,799 semi-hollow IV 0,800
32、 hollow 4.2 Testing of the index angle 4.2.1 Test equipment See 4.1.1. DIN EN 299:2009-11 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 Computation of index angle The index angle for this standard is quantitatively defined as the 80 % angle. This is
33、 the angle according to Equation (1) corresponding to the inner angle where 80 % of the liquid volume is collected. ()( )()+=121VVVVY (1) where Y is the index angle; V is 50 %, if the 50 % index angle is to be computed, 80 %, if the 80 % index angle is to be computed; V1is the cumulative volume in p
34、ercent collected in all patternator compartments up to and including the compartment such that V1is as large as possible without exceeding the value of 80 %, if the 80 % angle is computed, or without exceeding 50 %, if the 50 % angle is computed; V2is the cumulative volume in percent collected in al
35、l patternator compartments up to and including the compartment such that V2is as small as possible but still exceeds the value of 80 %, if the 80 % angle is computed, or still exceeds the value of 50 %, if the 50 % is computed; is the plane angle subtended by outer edge of compartment corresponding
36、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 95 100 96 to 105 DIN EN 299:2009-11 EN 299:2009 (E) 7 Dimensions in millimetres Figure 1 DIN EN 299:2009-11
37、 EN 299:2009 (E) 8 Dimensions in millimetres Figure 2 DIN EN 299:2009-11 EN 299:2009 (E) 9 Table 3 Tube No. Collected tube volumeml Cumulative volume % Plane angle degrees 1 2 1,923077 14,52 9 10,57632 28,53 14 24,03846 41,7 4 22,5 45,67308 53,95 25 69,71153 64,86 14,5 83,65384 74,6 7 5,5 88,9423 83
38、,38 3 91,82691 90,99 2,5 94,23076 97,6 10 2 96,15384 103,611 98,07692 108,812 2 100,0 113,5 13 0 100,0 121,314 100,0 128,5EXAMPLE Example showing collected liquid volumes, conversion to cumulative percent volume, and corresponding plane angles: Test references: oil burner nozzle “Hollow“ 0,85 GPH 60
39、 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 volume plane angle ratio = 0,7755194 4.3 Explanations The determin
40、ation 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. DIN EN 299:2009-11
