1、UDC 620.1: 536.468: 542.42: 662.951.2 DEUTSCHE NORMEN February 1977 I I Testing of Materials Burning Behavisur of Materials Burner - DIN 50 051 Prfung von Werkstoffen; Brennverhalten von Werkstoffen; Brenner Dimensions in mm 1 Purpose and range of application This Standard describes a burner using p
2、ropane as fuel gas, the flame of which can be used to ignite materials such as plastics, textiles, etc. when testing the burning behaviour of said materials. With the aid of this burner, a flame with estimable dimensions and with a constant temperature profile is capable of being generated. The flam
3、e height can be adjusted from 10 mm to 60 mm. 2 Description of the burner The burner shall feature the dimensions specified in Fig. 1 a) and shall comprise the following components: Fine adjustment valve Fuel gas jet (serial number 1) Burner tube (serial number 2) Outlet stabilizer (serial number 3)
4、 Particular attention shall be paid to the dimensional tolerances and surface finishes specified in Fig. 1 b) and Fig. IC). 2.1 Fine adjustment valve A fine adjustment valve 1 ) by means of which the fuel gas feed can be adjusted according to the conditions laid down in Section 4 shall be fitted. Th
5、e burner may be mounted directly on the fine adjustment valve, accord- ing to Fig. 2. 2.2 Fuel gas jet The fuel gas jet is the component illustrated in Fig. 1 b). The internal diameter of the fuel gas jet bore shall amount to O. 17 mm. The gas feed in the fuel gas jet shall have an internal dia- met
6、er of 2 mm and shall be machined with a permissible deviation of k O. 1 mm. The grooved recess illustrated in Fig. 1 a) is designed to create a given degree of turbulence of the aspirated air. The dimensions of this grooved recess must therefore be adhered to within a permissible deviation of IO.1 m
7、m. 2.3 Burner tube The burner tube comprises 4 functional zones: Mixing chamber Tapered acceleration zone Straight guide zone Outlet aperture 2.3.1 Mixing chamber The burner tube features 4 circular air inlet holes of 4 mm diameter in the mixing chamber zone, as illu- strated in Fig. 1 cl. The top e
8、dge of the fuel gas jet must be situated 0.5 mm beneath the apex of the air inlet holes. The air inlet holes control the air supply by Venturi effect. 2.3.2 Acceleration zone, guide zone and outlet aperture The acceleration zone is tapered in accordance with the dimensions specified in Fig. 1 cl. It
9、 leads into the guide zone of constant diameter. The gas outlet aperture is bored out to 3.0 mm. 2.4 Outlet stabilizer The outlet stabilizer is manufactured in accordance with Fig. 1 di. Its purpose is to stabilize the flame. 3 Fuel gas 3.1 Propane in accordance with DIN 51 622 shall be used as fuel
10、 gas. 3.2 The fuel gas pressure upstream of the burner fine adjustment valve shall amount to 500 mbar 2). 3.3 The fuel gas shall be at the same temperature as the test room. 4 Testflame 4.1 Adjustment of test flame The length of the test flame shall be adjusted by means of the fine adjustment valve
11、with the burner in vertical posit ion. 4.2 Length of test flame The length of the test flame shall be understood to be the distance between the front end face of the stabilizer and the tip of the flame shining with a yellowish glow. 1) Addresses of sources of supply can be obtained from: DI N-Bezugs
12、quellen fr normgerechte Erzeugnisse im DIN Deutsches Institut fr Normung e. V., Burggrafenstrasse 4-10, 1000 Berlin 30. 2) It is also permissible to operaie on 50 mbar; in this event, a note to this effect must be recorded in the test report. Continued on page 2 to 3 Explanations on page 3 Sole sale
13、 rights of German Standards (DIN-Normen) are with Beuth Verlag GrnbH. Berlin 30 07 90 DIM 50 057 engl. Preisgr. 4 Vertr.-Nr. 0104 Page 2 DIN 50 051 Static tube / to be adjusted on assembly 7 Fuel gas jet Grooved recess 2 Burnertube 3 Outlet stabilizer a) General view of burner without fine adjustmen
14、t valve b) Fuel gas jet (serial number 1) -v c) Burner tube (serial number 2) W d) Outlet stabilizer (serial number 3) w, rn Surfaces series 1 DIN 3141 Figure 1. Burner DIN 50 051 Page 3 Figure 2. Example of arrangement of burner and fine adjustment valve Explanations This Standard has been elaborat
15、ed in co-operation with the Small burner“ Working Group of Advisory Committee FNK 104 “Burning behaviour“and the Advisory Com- mittee FNM C 9i “Testing of the burning behaviour of textiles“. It appeared desirable to edit this Standard because the burner specified herein is used in several process St
16、andards and is described in detail and in the same way in said Standards. When new editions of these Standards are published in due course, and when further process Standards are compiled, it will therefore be possible to dispense with the description of the burner in these Standards. The burner des
17、cribed in this Standard is used at the present time, amongst others, in the test processes iiccording to DIN 4102 Part 1 “1, DIN 53 438 Part 1 *), Part 2 “1 and Part 3 “1, DIN 54 332, DIN 54 333 (Preliminary Standard), DIN 54 334, DIN 54 335 *) and DIN 57 471 Part 5. “) At present still in draft form
